simuv3 update and advisory on rolling resistance

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1) I updated the moment of inertia so that all three moments of the car
are affected equally by the mass centering coefficient.

2) I updated the engine code so that the backfire sound appears more
frequently

3) rolling resistance:

After a lot of testing with powerful RWD cars with low friction tyres, I
have come to the conclusion that a rolling resistance of 0.001 is far
too low. Increasing it to 0.01 for most road surfaces works very well,
while dirt tracks should probably have it at 0.1 or so.

I especially helps a lot when correcting over-steering. It prevents the
sudden snap in the other direction which you may experience in some cases.

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