Physics: Properly handle friction

From @rothbauerw:

> I only see handling for slip friction. I don't see handling for rolling friction. The coefficients of friction are very different for rolling vs. slip. I think this is a major contributor to the ball not feeling like it's accelerating like a real table at times. It also limits some of the action you see with low velocity bounces off of rubbers.
>
> Raising friction makes over all pace of a table more realistic while sacrificing the points above. Lowering friction makes addresses the issues above, but then the table plays too fast.

@Cupiii might be interested in having a look at this.