The beginnings of my new (I don't know what generation # this is now, 4th+ easily) code to rasterise CoreGraphics style lines in Metal.

The goal is to prevent overdraw as much as possible (hard to do when some of the angles between lines are super sharp) so that alpha blending looks good no matter what.

Also this code handles t-junctions as special cases - so you can render graphs of lines - not just strings…

this is going to go into MetalSprocketsAddOns