Vehicle Synchronization

This include contains some bug fixes and new vehicle related functions.

Bug Fixes

No more desynchronized vehicle colors when using -1 for the color parameters.
Players won't collide anymore if they enter at once inside a mod shop.
OnVehicleRespray isn't called anymore when you exit a mod shop if the colors didn't change.
OnVehicleRespray isn't called anymore when a component is previewed inside a mod shop.
Now the Firetruck (ladder variant) has the addsiren parameter set to true by default.
Vehicles won't change their color to white anymore when a paintjob is removed.
Bullbar components won't use anymore the same slots as front/rear bumpers (GetVehicleComponentInSlot).
Now GetVehicleComponentInSlot works correctly when checking the CARMODTYPE_STEREO slot.
Players won't crash anymore if someone tries to add an invalid component to a vehicle.

Now Pay 'n' Spray shops apply random colors and call OnVehicleRespray.
Now ChangeVehicleColor applies random colors when using -1 for the color parameters.
When using random colors, vehicles get their own colors, those used single player.
Two new vehicle component slots: CARMODTYPE_FRONT_BULLBAR, CARMODTYPE_REAR_BULLBAR. Check "Modified Functions" in the documentation.
Neon lights related functions (with offsets for all vehicles and Streamer support).
New functions and callbacks (check the documentation).