Building a tool for creating shapes with boolean operators

[joseedil]

Building a tool for creating shapes with boolean operators (eg. union, intersection, exclusion, difference). The core operations are defined here: https://hackage.haskell.org/package/cubicbezier-0.6.0.6/docs/Geom2D-CubicBezier-Overlap.html. Right now it's quite a chore to define shapes that could easily be described by boolean operations over rectangles, circles and ellipses.