Simplify GameRounds package handling. AH-282
Clean up physics on server. AH-282
Remove disconnected players' characters. AH-282
Add velocity ("position") to player control package. AH-282
Actorized the circling boxes. AH-282

Also made sure client and server has creates different actor ids.
Merge remote-tracking branch 'origin/AH-282_Create_level' into AH-282_Create_level
Fix merge to work. AH-282