[ASSETS] [OPEN SOURCE] Tanks, tracks and N-wheeled vehicles

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This is a very early prototype of Mark-I tank (press 4 to posses):
https://www.dropbox.com/s/g4q8sk7gvf3tc71/MarkI_Prototype.rar?dl=0

It doesn’t drive nicely and has some issues with controls. But the main point was to get custom friction working without any kind of suspension.
Tank can easily get stuck on logs as friction is processed only in selected points of the track. Now I need to figure out how this functionality can be ported to A_TrackedVehicle class for sprocket and idler. There are some other changes to the math behind friction calculation and I need to re-factor few functions to get it working properly.