Investigate skipping Box2Rotated.CalcBoundingBox calculations

[metalgearsloth]

So I have this benchmark where Rotation == Angle.Zero is at the top.

It's kind of a judgment call as to whether there's significantly more rotated Box2Rotateds than normal ones. The ideal case being 300% faster but the worst case being 15% slower, but it really depends how often each one occurs in relation to one another.

Stuff like EntityLookup is probably 0 rotation most of the time, same with sprite drawing, but then overlay calculations or other stuff done in world terms is likely rotated?

I'll try to get some debug count at some point to know how many are being done but without some level of surety better to leave it I think.