Tire force combining review

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Here is what I'd like to move to.

touring.tire using simplified Pacejka combining (4 parameters instead of 15):


All three tire types (touring, sport, slick) will be using the same (hankook) combining parameters for now. They can be individually adjusted though.

I'll push tire editor updates when ready: https://github.com/logzero/vdrift-tools

I also would like to make some adjustments to the tire curves in general, to have a more clear difference between the tires (pushed a change to reduce side grip of touring.tire today).