Changelog 0.0.9

Add:
- Annulation of contracts automatically upon disconnection.
- Disparition of trailers when disconnecting
- Added NPCs to display company cars.
- Added mission system (tutorial) / deactivatable with "K"

Corrections:
- Correction command /spawnvehjob
- IA Bus Correction
- Correction of lights
- Correction of 180 minor errors

Orders :
- Added the /cancelcontract command (allows to cancel its contract if necessary)