Alpha Powerups. The Police/Military Ordnance Update! 0.5.3

Fixes
- Fixed traffic vehicles being stuck within some active powerups (eg. Fetzi, Barrier, Tire Spikes, Snipers). Thanks @Bulbert for reporting it! This fix is temporary, in the future the powerups lib will support a AI logic controller, so that powerups can decide when and if to execute.

- Fixed the repair powerup crashing the game if a vehicle was deleted that had its ghosting effect active. Thanks @Bulbert for reporting it!

- Fixed the repair powerups never unghosting a traffic vehicle when it was unghosted while it was pooled

Pull request