Codechange: automatic adding of _t to (u)int types, and WChar to char32_t

for i in `find src -type f|grep -v 3rdparty/fmt|grep -v 3rdparty/catch2|grep -v 3rdparty/opengl|grep -v stdafx.h`; do sed 's/uint16& /uint16 \&/g;s/int8\([ >*),;[]\)/int8_t\1/g;s/int16\([ >*),;[]\)/int16_t\1/g;s/int32\([ >*),;[]\)/int32_t\1/g;s/int64\([ >*),;[]\)/int64_t\1/g;s/ uint32(/ uint32_t(/g;s/_uint8_t/_uint8/;s/Uint8_t/Uint8/;s/ft_int64_t/ft_int64/g;s/uint64$/uint64_t/;s/WChar/char32_t/g;s/char32_t char32_t/char32_t WChar/' -i $i; done

(svn r19353) -Codechange: use static objects for the airport statemachines instead of new/delete at the start/end of the game
-Codechange: store the fta in AirportSpec

(svn r16614) -Codechange: Make the airport min/max available year a property of the Airport class.
-Change: rename station.always_small_airport to station.never_expire_airports to make it more future-proof

(svn r13251) -Codechange: rename _patches to _settings as that is more logic.
-Codechange: move all Settings into substructs of _settings in a way that they are logically grouped.

(svn r13226) -Feature: Allow to have more than only two airports per town. The number of airports is now controlled by the noise each of them generates, the distance from town's center and how tolerant the town is.
Initial concept : TTDPatch (moreairpots), Initial code : Pasky
Thanks to BigBB (help coding), Smatz Skidd13 and frosch for bugcatches and advices

(svn r8822) -Fix

Variable scope, const

(svn r8767) -Fix

-Codechange: Do not hardcode the catchment radius of airports, but hold the information in AirportFTAClass
-Fix (r979): The default AI tested possible airport locations with a fixed catchment radius instead of the radius of the to be built airport

(svn r8748) -Fix

-Codechange: Do not hardcode the airports with a short airstrip anymore, but make it a flag in AirportFTAClass

(svn r8747) -Fix

-Codechange: Make the encoding of accepted aircraft types of airports a bit more sensible and move the enum into struct AirportFTAClass

(svn r8743) -Fix

-Codechange: Add a Z adjustment attribute for helicopter pads to AirportFTAClass to get rid of some special cases for oilrigs and heliports

(svn r8660) -Fix

-Codechange: Remove _avail_aircraft
Its name is misleading. It is rather _avail_airports, but then only some of them, which leads to inconsistencies when using it.
Further it is unnecessary to store it in savegams.

(svn r8582) -Fix

Reorder the attributes of some structs to reduce their size

(svn r8570) -Fix

Add a regular constructor and destructor to AirportFTAClass

(svn r8559) -Fix

-Codechange: Put the airport movement data into struct AirportFTAClass