3502: Some (mostly backported) refactor r=Learath2 a=Kaffeine
Port some cleanup and refactoring from the upstream and add some custom refactoring.
Changes overview:
- Backported angle() and direction() functions (upstream commit 7735557aa5)
- Backported vector math cleanup (remove some pointless templates, refactor other functions; upstream commit bdaabc10bc)
- `ddracechat.h` (used by both client and server) moved to a shared dir next to `ddracecommands.h`
- Backport `IGameController::DoActivityCheck()`
- Backport `IGameController::DoTeamChange()`
- Backport `IGameController::OnPlayerDisconnect()`
- Refactor Emote-related code (decouple the code and hide the details in CPlayer class)
- Fix: restore default emote on the emote override ended over.
- CCharacter::HandleTiles(): Move a part of DDRace-specific code to the DDRace GameController
- Add `IGameController::GetMaskForPlayerWorldEvent()` to port classes away from direct `CGameControllerDDRace/CGameTeams` usage.
Result overview:
- CPlayer does not depend on CGameControllerDDRace nor CGameTeams anymore
- CCharacter does not depend on CGameControllerDDRace anymore
I'm not sure that `GetMaskForPlayerWorldEvent()` is a good name for that. The idea of the method is to abstract the users of `CreateExplosion`, `CreatePlayerSpawn`, `CreateDeath`, `CreateSound`, and other world events from thinking about the player team.
I checked that the client and server work (didn't do deep testing though).
## Checklist
- [x] Tested the change ingame
- Provided screenshots if it is a visual change (no visual changes)
- Tested in combination with possibly related configuration options (no related options)
- [ ] Written a unit test if it works standalone, system.c especially
- [x] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)
Co-authored-by: Alexander Akulich <akulichalexander@gmail.com>
Co-authored-by: BeaR <cinaera@web.de>
5d927f35b6