Codechange: Don't scan vehicle pool to find targeting disaster vehicle when deleting any vehicle. (#12064)

* Codechange: Don't scan vehicle pool to find targeting disaster vehicle when deleting any vehicle.

When deleting a vehicle, the vehicle pool is scanned to find a targetting disaster vehicle. With lots of vehicles this can take some time, especially when deleting multiple consecutive vehicles.

Disasters vehicles can actually only target road vehicles. Store the DisasterVehicle index in the road vehicle, so that no pool scan is necessary.

* Change: Small UFOs no longer target a vehicle which is already a target.

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

Cleanup: Remove unnecessary VehicleRandomBits()

Simple Random() assignment to byte does the same.

(svn r18781) -Codechange: pass the CommandCost to the callback instead of whether it succeeded or not.
-Fix: AIs did update their last cost incorrectly in network games if the cost of the DC_EXEC phase differed from the ~DC_EXEC phase.

(svn r17897) -Fix [FS#3255]: CB15 and CB36 (capacity) were not always called when they should.
-Codechange: Move capacity calculation to a single function for all vehicle types, so the behaviour can be kept consistent easier.

(svn r14258) -Codechange: rework the way to query the vehicle hash to make sure it always results in the same irregardless of the order of the hash-linked-list.
-Fix: desync in PBS reservation following, vehicle flooding and road vehicle overtake/follow code.

(svn r12791) -Codechange: [autoreplace] Added a flag parameter (listens for DC_EXEC and DC_QUERY_COST) and included more info when returning CommandCost
This allowed cleaning up the code in MaybeReplaceVehicle()

(svn r12629) -Codechange: Split VehicleNeedsService() into Vehicle::NeedsServicing() and Vehicle::NeedsAutomaticServicing().
-Fix (r11052): Disable servicing by service-interval if a vehicle has depot orders.

(svn r11916) -Codechange: use enums from VehicleViewWindowWidgets instead of constants
-Fix: refit button widget was not correctly updated

(svn r11802) -Fix [FS#716]: do not crash trains when leaving depot to a very long track
-Codechange: use dedicated pathfinder for signal updating, resulting in better performance and possible future improvements