[Particle Effects] Dust Clouds about collision-domain HOT 7 CLOSED

Currently building a particle model for this purpose.

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Built the particle model as well as I can, awaiting method to find when wheels 
lose traction

I guess for now I could just give you the case where the brakes are on but the 
car is still moving?

Debugging the individual friction on a wheel at any given time hasn't really 
yielded anything interesting, but it seems the possible things to look at is 
endless..

I now also have slip angle calculations 
(http://en.wikipedia.org/wiki/Slip_angle) which are part of a much broader 
formula for friction by some guy called Pacejka, but it's way over my head at 
the moment.

I'll tidy up my code and commit some (hopefully useful) functions tomorrow :)