Minor improvements in nametags

Changed logic, so that tags are not drawn while player is inside a car.
Also changed logic so that tags for vehicles are drawn slightly above
the engine.
Cleanup

Removed unused time-sync scripts.
Change ilseep calls in convoy to regular sleep calls

For some reason isleep calls do not work well when used in dedicated
server. They get stuck after a few minutes of the server running
Modify camera functions to follow players inside vehicles

Modified the camera functions to follow players inside vehicles, however
if player enter or exits the vehicle, it wont be switche automatically.
You have to press one of WASD keys for the switch to happen. Also
changed the camera target function so that it's able to see vehicles.