Add TopDownFrictionJoint
Tweaked units to make the friction joint work
Merge branch 'master' into topdown
Merge branch 'master' into topdown
Added torque limiting at high robot speeds
Upped the "angular friction" in BodyBuilder
Made engine force be shared between the wheels
Fixed bug with occassional overly high accelerations
Fixed wheel force distribution to actually distribute full power value
Increased the size of large resources to make them uncarriable by single agents
Merge branch 'topdown'