WIP Cars

[NaN]

Been busy with the lighting/sky simulation lately.

But in general plan is:
1. Allow to select renderer config in options (gl2/simple, gl2/advanced, gl3/advanced). -> This is almost ready. I would like to remove the noshaders code path first though (it is just slowing us down).
2. Implement new shading code separate from the default one, so that it can be selected (gl3/experimental). -> I've got the equations, but no shaders written yet.
3. Add a car variant (360 or CO) which uses new material texture (360ex.car). -> Nothing done here yet. Converting cars to the new material might be the most time consuming part.
4. Get someone to convert the remaining cars.... lol

This way it should be possible to avoid breaking things while transitioning to the new shading/material implementation.