Make bezier control point coordinates relative

Make bezier control point coordinates relative

So the quad tree should just have to care about bounding rectangles.
Also so the GPU renderer now doesn't need transforming but CPU renderer does now.

AddBezier assumes absolute coordinates and transforms to relative coordinates
AddBezierData is assuming relative coordinates.

Totally clear.

PS: Basically whatever is convenient/efficient for the GPU is inconvenient/inefficient for the CPU
and vice versa. Fun!