Codechange: Spell 'Viewport' consistently

Some places in the codebase misspell 'Viewport' as 'ViewPort' or 'view_port'.
This patch makes everything consistent.

Update: Translations from eints
finnish: 1 change by hpiirai

Update: Translations from eints
finnish: 4 changes by hpiirai
english (us): 20 changes by Supercheese
french: 7 changes by glx
korean: 7 changes by telk5093

Update: Translations from eints
finnish: 11 changes by hpiirai
korean: 6 changes by telk5093

Update: Translations from eints
english (us): 2 changes by njn

Update: Translations from eints
english (us): 38 changes by njn

Update: Translations from eints
dutch: 27 changes by JanWillem
french: 29 changes by glx
hungarian: 3 changes by Brumi
korean: 71 changes by telk5093

Update: Translations from eints
english (us): 3 changes by Supercheese
spanish (mexican): 18 changes by Absay
hungarian: 2 changes by Brumi
latin: 33 changes by Supercheese

Update: Translations from eints
finnish: 2 changes by hpiirai
english (us): 17 changes by Supercheese
luxembourgish: 10 changes by Phreeze
dutch: 20 changes by JanWillem
norwegian (bokmal): 2 changes by Leifbk
latin: 16 changes by Supercheese
portuguese: 3 changes by JayCity

Update: Translations from eints
finnish: 13 changes by hpiirai
korean: 1 change by telk5093

Remove: DOS support

In 10 years there was no active development on DOS. Although it
turned out to still work, the FPS was very bad. There is little
interest in the current community to look into this.

Further more, we like to switch to c++11 functions for threads,
which are not implemented by DJGPP, the only current compiler
for DOS.

Additionally, DOS is the only platform which does not support
networking. It is the reason we have tons of #ifdefs to support
disabling networking.

By removing DOS support, we can both use c++11 functions for threads,
and remove all the code related to disabling network. Sadly, this
means we have to see DOS go.

Of course, if you feel up for the task, simply revert this commit,
and implement stub c++11 functions for threads and stub functions
for networking. We are more than happy to accept such Pull Request.

Remove: BeOS support (deprecated by Haiku)

In 10 years there is no commit to change how BeOS works, and we
have no active maintainer for it. It is unlikely it works in its
current state (but not impossible).

With the arrival of SDL2 (and removal of SDL), BeOS is no longer
support. SDL2 suggests to use Haiku instead of BeOS.

Remove: MorphOS / AmigaOS support

In 10 years there is no commit to change how MorphOS works, and we
have no active maintainer for it. It is unlikely it works in its
current state (but not impossible).

With the arrival of SDL2 (and removal of SDL), MorphOS is no longer
support. There is an SDL2 port for MorphOS, but it is not maintained
by upstream SDL2, and nobody can currently test it out.

If anyone wants to re-add MorphOS, please do (revert this patch,
fix the problems, and create a Pull Request). If you need any help
doing so, let us know! It is not that we don't like MorphOS, it is
that we don't have anyone fixing the problems :(

Update: Translations from eints
finnish: 40 changes by hpiirai
english (us): 19 changes by njn
spanish (mexican): 3 changes by njn

Update: Translations from eints
danish: 11 changes by nielsmh
spanish (mexican): 11 changes by Absay
hungarian: 100 changes by Brumi
russian: 6 changes by Lone_Wolf
croatian: 9 changes by VoyagerOne

Update: Translations from eints
english (us): 11 changes by njn
dutch: 244 changes by JanWillem
turkish: 102 changes by wakeup

Update: Translations from eints
english (us): 1 change by njn

Update: Translations from eints
english (us): 64 changes by njn
polish: 2 changes by McZapkie
danish: 1 change by njn
french: 2 changes by glx

Update: Translations from eints
greek: 15 changes by fumantsu
dutch: 73 changes by JanWillem

Update: Translations from eints
belarusian: 1 change by translators
norwegian (nynorsk): 1 change by translators
chinese (simplified): 1 change by translators
serbian: 1 change by translators
czech: 1 change by translators
esperanto: 1 change by translators
chinese (traditional): 1 change by translators
portuguese (brazilian): 1 change by translators
norwegian (bokmal): 1 change by translators
swedish: 1 change by translators
lithuanian: 1 change by translators
hebrew: 1 change by translators
croatian: 1 change by translators
bulgarian: 1 change by translators
catalan: 1 change by translators
afrikaans: 1 change by translators
vietnamese: 1 change by translators
slovenian: 1 change by translators
faroese: 1 change by translators
thai: 1 change by translators
frisian: 1 change by translators
scottish gaelic: 1 change by translators
persian: 1 change by translators
korean: 1 change by translators
greek: 1 change by translators
latin: 1 change by translators
welsh: 1 change by translators
galician: 1 change by translators
japanese: 1 change by translators
english (au): 1 change by translators
italian: 6 changes by lorenzodv, 1 change by translators
urdu: 1 change by translators
french: 7 changes by glx
malay: 1 change by translators
tamil: 1 change by translators
spanish: 4 changes by SilverSurferZzZ, 1 change by translators
slovak: 1 change by translators
basque: 1 change by translators
polish: 1 change by translators
indonesian: 1 change by translators
arabic (egypt): 1 change by translators
russian: 2 changes by Lone_Wolf, 1 change by translators
hungarian: 1 change by translators
luxembourgish: 1 change by translators
romanian: 1 change by translators
irish: 1 change by translators
latvian: 1 change by translators
german: 1 change by translators
danish: 1 change by translators
spanish (mexican): 7 changes by Absay
icelandic: 1 change by translators
english (us): 1 change by translators
turkish: 1 change by translators
portuguese: 1 change by translators
ukrainian: 1 change by translators
finnish: 1 change by translators
dutch: 1 change by translators
estonian: 1 change by translators

Update: Translations from eints
french: 3 changes by glx

Update: Translations from eints
italian: 1 change by lorenzodv
french: 29 changes by glx

Update: Translations from eints
greek: 46 changes by kyrm
italian: 44 changes by lorenzodv

Update: Translations from eints
latin: 19 changes by Supercheese
english (us): 19 changes by Supercheese

Change: Use name of cargo instead of Passengers/Mail in town statistics. (#6801)

* Change: Use name of cargo instead of Passengers/Mail in town statistics.
* Cleanup: Remove strings from all language files.

(svn r27828) -Update from Eints:
croatian: 2 changes by VoyagerOne
italian: 6 changes by lorenzodv
english (us): 15 changes by Supercheese
latin: 15 changes by Supercheese

(svn r27824) -Update from Eints:
catalan: 7 changes by juanjo
croatian: 4 changes by VoyagerOne
korean: 15 changes by telk5093
scottish gaelic: 54 changes by GunChleoc

(svn r27761) -Update from Eints:
croatian: 3 changes by VoyagerOne
italian: 5 changes by lorenzodv
english (us): 4 changes by Supercheese
latin: 4 changes by Supercheese

(svn r27692) -Update from Eints:
croatian: 25 changes by VoyagerOne
english (us): 2 changes by Supercheese
russian: 1 change by Lone_Wolf
latin: 25 changes by Supercheese

(svn r27484) -Update from Eints:
croatian: 4 changes by UnderwaterHesus
english (us): 1 change by Supercheese
serbian: 21 changes by stravagante
latin: 1 change by Supercheese

(svn r27478) -Update from Eints:
german: 8 changes by translators, 2 changes by frosch
arabic (egypt): 36 changes by translators
afrikaans: 4 changes by translators
hungarian: 1 change by translators
english (us): 1 change by translators
frisian: 2 changes by translators
norwegian (bokmal): 5 changes by translators
norwegian (nynorsk): 1 change by translators
lithuanian: 5 changes by translators
slovenian: 4 changes by translators
russian: 1 change by translators
ukrainian: 2 changes by translators
welsh: 3 changes by translators
french: 5 changes by glx
english (au): 1 change by translators
irish: 1 change by translators
tamil: 1 change by translators
belarusian: 2 changes by translators
bulgarian: 1 change by translators
italian: 1 change by translators
scottish gaelic: 1 change by translators
romanian: 2 changes by translators
urdu: 5 changes by translators
turkish: 11 changes by translators
portuguese: 1 change by translators
latvian: 2 changes by translators
esperanto: 1 change by translators
dutch: 3 changes by translators
serbian: 1 change by translators
spanish: 1 change by translators
czech: 4 changes by translators
indonesian: 2 changes by translators
latin: 1 change by translators
catalan: 2 changes by translators
hebrew: 9 changes by translators
greek: 5 changes by translators
polish: 1 change by translators
chinese (traditional): 1 change by translators
slovak: 1 change by translators
icelandic: 2 changes by translators
portuguese (brazilian): 4 changes by translators
danish: 2 changes by translators
vietnamese: 6 changes by translators
malay: 2 changes by translators
galician: 4 changes by translators
croatian: 1 change by translators
korean: 4 changes by translators
finnish: 1 change by translators
chinese (simplified): 1 change by translators
estonian: 3 changes by translators
persian: 4 changes by translators
thai: 6 changes by translators
swedish: 1 change by translators
luxembourgish: 3 changes by translators
japanese: 5 changes by translators
basque: 2 changes by translators

(svn r27391) -Update from WebTranslator v3.0:
english_US - 2 changes by Supercheese

(svn r27293) -Update from WebTranslator v3.0:
traditional_chinese - 4 changes by siu238X
danish - 4 changes by beruic

(svn r27201) -Update from WebTranslator v3.0:
english_US - 4 changes by Supercheese
latin - 4 changes by Supercheese

(svn r27165) -Update from WebTranslator v3.0:
english_US - 3 changes by Supercheese

(svn r27118) -Update from WebTranslator v3.0:
english_US - 1 changes by Supercheese
irish - 5 changes by tem

(svn r27017) -Update from WebTranslator v3.0:
catalan - 11 changes by juanjo
english_US - 1 changes by Supercheese
german - 6 changes by planetmaker
hungarian - 14 changes by Brumi
italian - 1 changes by lorenzodv
latin - 6 changes by Supercheese
spanish - 3 changes by SilverSurferZzZ
welsh - 8 changes by kazzie

(svn r27001) -Update from WebTranslator v3.0:
afrikaans - 4 changes by telanus
catalan - 16 changes by juanjo
english_US - 6 changes by Supercheese
french - 5 changes by glx
hungarian - 66 changes by IPG
italian - 5 changes by lorenzodv
korean - 5 changes by telk5093
russian - 5 changes by Lone_Wolf
spanish - 4 changes by SilverSurferZzZ

(svn r26987) -Update from WebTranslator v3.0:
english_US - 8 changes by Supercheese
german - 9 changes by planetmaker
korean - 10 changes by telk5093
russian - 8 changes by Lone_Wolf

(svn r26979) -Update from WebTranslator v3.0:
english_US - 1 changes by Supercheese

(svn r26963) -Update from WebTranslator v3.0:
english_US - 3 changes by Supercheese
hebrew - 10 changes by oofnik
norwegian_bokmal - 39 changes by cuthbert

(svn r26949) -Update from WebTranslator v3.0:
catalan - 2 changes by juanjo
english_US - 5 changes by Supercheese
brazilian_portuguese - 19 changes by Tucalipe
russian - 3 changes by Lone_Wolf
spanish - 2 changes by SilverSurferZzZ

(svn r26909) -Update from WebTranslator v3.0:
belarusian - 13 changes by KorneySan
catalan - 1 changes by juanjo
english_US - 15 changes by Supercheese
german - 13 changes by planetmaker
italian - 14 changes by lorenzodv
korean - 17 changes by telk5093
polish - 13 changes by wojteks86
russian - 13 changes by Lone_Wolf

(svn r26846) -Update from WebTranslator v3.0:
bulgarian - 46 changes by Wold
english_US - 5 changes by Supercheese

(svn r26807) -Update from WebTranslator v3.0:
catalan - 18 changes by juanjo
croatian - 29 changes by VoyagerOne
english_US - 29 changes by Supercheese
italian - 29 changes by lorenzodv
russian - 29 changes by Lone_Wolf
spanish - 12 changes by SilverSurferZzZ

(svn r26761) -Update from WebTranslator v3.0:
catalan - 2 changes by juanjo
english_US - 3 changes by Supercheese
spanish - 2 changes by juanjo

(svn r26760) -Update from WebTranslator v3.0:
english_US - 1 changes by Supercheese
ukrainian - 62 changes by Strategy

(svn r26738) -Update from WebTranslator v3.0:
catalan - 23 changes by juanjo
simplified_chinese - 50 changes by siu238X
traditional_chinese - 82 changes by siu238X
english_US - 49 changes by Supercheese
norwegian_bokmal - 2 changes by cuthbert
russian - 47 changes by Lone_Wolf
slovak - 1 changes by Milsa

(svn r26727) -Update from WebTranslator v3.0:
english_US - 1 changes by Supercheese
finnish - 1 changes by jpx_
polish - 6 changes by p0358

(svn r26664) -Update from WebTranslator v3.0:
traditional_chinese - 15 changes by yjw691
english_US - 1 changes by Supercheese
lithuanian - 50 changes by Stabilitronas

(svn r26658) -Update from WebTranslator v3.0:
estonian - 1 changes by

(svn r26638) -Update from WebTranslator v3.0:
english_US - 1 changes by Supercheese

(svn r26619) -Update from WebTranslator v3.0:
catalan - 3 changes by juanjo
english_AU - 2 changes by mrtux
english_US - 29 changes by Supercheese
korean - 2 changes by telk5093

(svn r26588) -Update from WebTranslator v3.0:
english_US - 1 changes by Supercheese
lithuanian - 3 changes by
slovak - 15 changes by Milsa

(svn r26587) -Update from WebTranslator v3.0:
english_US - 3 changes by Supercheese
lithuanian - 3 changes by

(svn r26569) -Update from WebTranslator v3.0:
english_AU - 1 changes by mrtux
english_US - 1 changes by Supercheese
french - 57 changes by glx
german - 5 changes by planetmaker
korean - 1 changes by telk5093
lithuanian - 3 changes by
luxembourgish - 51 changes by Phreeze
russian - 1 changes by KorneySan

(svn r26555) -Update from WebTranslator v3.0:
czech - 18 changes by Eskymak
english_US - 5 changes by Supercheese

(svn r26537) -Update from WebTranslator v3.0:
catalan - 24 changes by juanjo
english_US - 25 changes by Supercheese
finnish - 31 changes by jpx_
german - 32 changes by planetmaker
korean - 43 changes by telk5093
luxembourgish - 39 changes by Phreeze
russian - 17 changes by Lone_Wolf

(svn r26530) -Update from WebTranslator v3.0:
catalan - 19 changes by juanjo
english_US - 18 changes by Supercheese
italian - 17 changes by lorenzodv