Polygonal collisions masks

Can you add those? Because now the only way to get polygonal collision masks is to use physics automatism, and many physic objects may lead to major slowdown. Also using physics objects just to get polygonal collision is dumb.

The main difficulty would be to implement collisions tests, but some algorithms seems to exists as long as the polygons remains convex.
So I’ll try to integrate this feature.

Well, I’m sure that you can also convert concave polygons into smaller convex ones, so this shape

will become this: