Codechange: Replace GroupStatistics' num_engines with std::map. (#11849)

This removes manual memory management with calloc/free calls, and prevents potentially large arrays being allocated for each group.

Codechange: Store Colours in Colours type. (#11625)

This reduces casts, some magic numbers, and introduces a bit of type-safety.

Fix: Changing default livery did not propagate to group liveries.

#11614 attempted to address this but did not handle 2CC properly, and changes to the default livery were not handled.

Cleanup: Remove some unused functions. (#11429)

These were picked up with cppcheck.

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

Fix 3c047b1: AIGroup.GetProfitLastYear could get values different than those displayed in GUI (#10227)

* Change: Store "all time" and "since minimum age" last year profits on groups

* Fix: Update last year profit for groups when copying vehicle statistics on autoreplace

* Codechange: Refactor profit last year

* Change: Rename some group related items for clarity

* Change: Reorder the fields in GroupStatistics

That way less memory gets wasted.

Codechange: Template DoCommand to automagically reflect the parameters of the command proc.

When finished, this will allow each command handler to take individually
different parameters, obliviating the need for bit-packing.

Codechange: Let the compile generate the master command table out of templated command traits.

This is using a non-intrusive type-traits like templated system, which
allows compile-time validation that the command table and the command
enum match up.

Feature: Show group name as part of the default vehicle name.

Only if the vehicle is member of a group and does not have a user defined name.

Fix #7224: Drag and drop vehicle group creation does not work correctly.

When drag and drop a vehicle into an empty slot in the vehicle group window it tries to create the new group as the subgroup of the first group (GroupID = 0). This is failing if the dragged vehicle's type is different than the first group's vehicle type.

Change: Allow vehicle group names to be non-unique.

Group names are visual identifiers, and do not need to be unique.
Group sorting already falls back to group ID if names are the same, so that sorted
list position is stable.

Feature: Group liveries, and livery window usability enhancements. (#7108)

* Change: Replace checkbox in livery selection window with Default option in drop down selection.

This reduces clutter in the UI and allows for primary/secondary colours to independently follow the default scheme if desired.

* Feature: Add vehicle group liveries.

(svn r15027) -Merge: tomatos and bananas left to be, here is NoAI for all to see.
NoAI is an API (a framework) to build your own AIs in. See:
http://wiki.openttd.org/wiki/index.php/AI:Main_Page
With many thanks to:
- glx and Rubidium for their syncing, feedback and hard work
- Yexo for his feedback, patches, and AIs which tested the system very deep
- Morloth for his feedback and patches
- TJIP for hosting a challenge which kept NoAI on track
- All AI authors for testing our AI API, and all other people who helped in one way or another
-Remove: all old AIs and their cheats/hacks

(svn r14958) -Codechange [FS#1923]: when checking for unique names, compare only with manually set names
There are situations that aren't solvable (because of different language files), so if the user really wants to have duplicated name, allow him to do so. It solves desyncs between server and clients using different languages. It behaves the same in SP and MP, so users won't see the different behaviour as a bug (and even checking in SP could be worked around by the user).