A stash before trying the PolyonClipper library. The original boundary
functions in PathBuilder are working but causing a BSOD on a a somewhat
absurd example - hundreds of small intersecting loops in self
intersecting paths. So am testing an existing library. To revert
to the original state rename PathBuilder_old to pathbuider and fix
a few things
Boundary conditioning and triangulations working.
Physics roughly working. Numerous issues found with
various platforms. Windows Box2d producing weird
artifacts. Neko having problems with logical &
html5 using the wrong drawing rule. So call this
a commit before I start bug fixing