Note: The GPU tesselation for drawPoints is disabled in this test PR, but will be re-enabled when I can run some benchmarks to see where a good cutoff exists.
Tessellation for circular or quarter circular paths is now handled by a single tessellator class that provides services for DrawCircle, DrawPoints (round caps), and DrawLines (round caps). Creating a general path is avoided along with the associated overhead of recognizing and using a generic tessellation step.