Removed last use of PolySet. This structure is completely replaced by the functionality in Poly. It might be possible to introduce polyset later, and let every Poly point to the Polyset in order to get the different materials. The downside with the current solution is that a lot of materials have to be cloned for each single Poly
Rename functions to Poly-convention
Ignore racertmp
Merge branch 'shape-cleanup'
Merge branch 'master' of github.com:sondrele/rust-raytracer