Patch 2.4.2

- national flags of riders
- ghosts of the fastest laps (BETA)
- refactoring of custom room
- more data about riders can be seen in the spectator
- new final screen
- refactoring of the room architecture in multiplayer
- refactoring race initialization
- refactoring of the loading screen
- better abstracting of rider / AI rider / ride architecture in the editor
- start postition can be seen on the minimap in the race
- penalties for restart are for gen 4+ now
- arrows to others no longer show up when you're lap up/down (it's useless when the other one is a ghost)