Allow /paint on certain vehicles only

[CodeAlDente]

Before applying a paintjob (that costs the player), first check if the current vehicle is able to get a paintjob. Good way to check that would be to create a function like IsVehiclePaintAble(vModel) that returns true or false wheter there is a paintjob available for that vehicle.

see http://wiki.sa-mp.com/wiki/Paintjob

Additional to this:

• Allow admins to use /paint