Codechange: refactor setting conversions and make sure it only happens once

By forcing it only happens once, the first time you upgrade to
a newer client, means you are free to jump between older and newer
versions after that. As they will not resync, the newer setting
can take on any of the (newer) values, without breaking the old
client. And when going to an old client and back, it doesn't
change it back to the converted value anymore.

Update: Translations from eints
swedish: 22 changes by Brickblock1

Update: Translations from eints
english (us): 21 changes by 2TallTyler
korean: 3 changes by telk5093
catalan: 27 changes by J0anJosep
turkish: 12 changes by densxd
french: 13 changes by Lishouuu

Update: Translations from eints
english (au): 3 changes by krysclarke
russian: 3 changes by Ln-Wolf
portuguese: 3 changes by azulcosta

Fix: Integer overflow in LinkGraphOverlay::ShowTooltip for long links

In particular when fully zoomed in
This could result in tooltips not being shown at all, or being shown
when not appropriate

Update: Translations from eints
english (au): 20 changes by krysclarke
swedish: 2 changes by SkogisREAL
japanese: 2 changes by fmang
welsh: 1 change by Ansbaradigeidfran
english (us): 2 changes by 2TallTyler
galician: 2 changes by pvillaverde
vietnamese: 2 changes by KhoiCanDev
korean: 8 changes by telk5093
hungarian: 1 change by PstasDev
indonesian: 1 change by ecolortest
italian: 2 changes by Rivarossi
german: 2 changes by Wuzzy2
russian: 9 changes by Ln-Wolf
finnish: 2 changes by hpiirai
catalan: 2 changes by J0anJosep
turkish: 2 changes by densxd
danish: 2 changes by bscargo
dutch: 2 changes by Afoklala
french: 2 changes by ZarTek-Creole
portuguese: 28 changes by azulcosta
esperanto: 2 changes by legoscia
portuguese (brazilian): 2 changes by ericandradex
polish: 2 changes by pAter-exe

Change: Clean up window title and button capitalization and wording (#11134)

* Change: Use consistent window title format for industry/cargo chains

* Change: Don't capitalize dropdown entry for cargo flow legend

* Change: Use consistent window titles for AI and GS settings

* Change: Use consistent window title for company value graph

* Change: Use consistent window title for industry funding

* Change: Use consistent button title to display industry chain

* Change: Use consistent button capitalization for local authority button on town window

* Fix: Don't capitalize random words in vehicle list management dropdown

* Fix: Use title case for Frame Rate window caption

* Fix: Use title case for Detailed Performance Rating window caption

Change: make Exclusive Transport Rights more exclusive (#11076)

Now, exclusive transport rights can only be bought if no company
currently owns them. A successful bribe will void any exclusive
transport rights that any *other* company currently has in the town.

Change: Don't save industry history if cargo slot isn't used. (#11133)

This avoids saving history of 16 slots per industry when in many cases (NewGRF dependent) only a couple are used.

Fix: Build road/tram stop windows did not set WindowDesc::ini_key (#11126)

Saved default window sizes were not persisted in the configuration file

Update: Translations from eints
indonesian: 71 changes by ecolortest

Codechange: make date-related variables constexpr (#11129)

This hints the compiler even more to result math-related questions
compile-time.

Update: Translations from eints
danish: 2 changes by bscargo
french: 2 changes by Lishouuu

Update: Translations from eints
polish: 3 changes by pAter-exe

Fix: [Emscripten] actually link against nlohmann_json (#11120)

We fake a plain (non-scoped) library, but we don't actually set
the library to anything valid. In result, it is never actually
linked.

Update: Translations from eints
dutch: 3 changes by Afoklala

Update: Translations from eints
vietnamese: 2 changes by KhoiCanDev

Update: Translations from eints
tamil: 3 changes by merni-ns

Update: Translations from eints
english (us): 15 changes by 2TallTyler
korean: 2 changes by telk5093
german: 41 changes by Wuzzy2
portuguese (brazilian): 2 changes by pasantoro

Fix: [Emscripten] switch to URL for content-service that supports WebSocket (#11106)

In the old days, content.openttd.org and bananas-server.openttd.org
ended up on the same route. But with a recent migration, they do not.
content.openttd.org only serves the custom TCP protocol, and
bananas-server.openttd.org only serves the HTTP(S).

Websockets use HTTPS, and as such, should be routed via the latter.

Update: Translations from eints
portuguese: 3 changes by azulcosta

Codechange: use std::string without const as return

Otherwise some compilers, e.g. MSVC, do not pick up that these are temporaries
and as such it will pass the temporaries to `const std::string &` instead of
the wanted `std::string &&`

Update: Translations from eints
english (au): 2 changes by krysclarke
italian: 14 changes by Rivarossi
russian: 2 changes by Ln-Wolf
finnish: 2 changes by hpiirai
tamil: 8 changes by merni-ns

Fix #4575: Use Latin 'l' in English translation of zloty. (#11090)

This avoids many truetype fonts being unusable due to this single character not being available.

Update: Translations from eints
welsh: 163 changes by Ansbaradigeidfran

Update: Translations from eints
dutch: 1 change by Afoklala

Update: Translations from eints
welsh: 28 changes by Ansbaradigeidfran
portuguese: 1 change by azulcosta
polish: 1 change by pAter-exe

Change: Add separate setting for server sent commands per frame limit (#11023)

Set a higher default value for this setting.
Use the higher of this and existing commands per frame limit
setting for server-originating commands, e.g. GS.

This is to support the GSAsyncMode class.
This also avoids undue throttling when more than one
script is in operation (e.g. AIs).

Codechange: Pass face index as font os_handle for FreeType fonts. (#11073)

This allows fallback font detection to test the specific face within the
font rather instead of only the first.

Update: Translations from eints
korean: 3 changes by telk5093
danish: 3 changes by bscargo

Update: Translations from eints
vietnamese: 1 change by KhoiCanDev
finnish: 3 changes by hpiirai
french: 5 changes by Naeso

Fix #11016: Defer deletion of client and server game socket handlers

This fixes various use after free scenarios in error handling paths

Fix: Error logging in game and admin server HandlePacket

Don't invent a packet type in the log message if we can't/don't
read a packet type at all.
Fix packet type not being logged when appropriate.

Change: Allow text shadow on WWT_EMPTY/WWT_TEXT to extend horizontally. (#11065)

This alleviates text shadows of truetype fonts being cropped in some
window layouts.

Codechange: Use std::optional for GRFConfig::GRFError (#11066)

This changes the semantics from "object pointer ownership" to "optional object", and simplifies copies.

Update: Translations from eints
english (au): 1 change by krysclarke
russian: 1 change by Ln-Wolf
turkish: 1 change by BeratSJ
french: 1 change by glx22
portuguese (brazilian): 4 changes by pasantoro

Update: Translations from eints
norwegian (bokmal): 1 change by buzzCraft
chinese (traditional): 1 change by wpi3
spanish (mexican): 1 change by absay
lithuanian: 1 change by devbotas
portuguese (brazilian): 3 changes by Greavez

Fix #11054: Prevent translation of currency codes.

Most languages stick with the 3-letter latin currency codes in the name
string, however some translations are... clever... and use the currency
symbol instead. Whilst this may look nice, it can cause issues with fonts
as some scripts have a specific limited set of fonts which do not include
these symbols.

Instead, hard code the currency code list and add it when drawing the
currency name.