new branch
added HalfEdgeMesh to SceneGraph
added triangle rendering capabilities of SceneGraph objects
fixed Mesh generics and integration
added SimplestSubdivision
added MeshLoaderTool
fixed HalfEdgeMesh
fixed HalfEdgeMesh
fixed SimplestSubdivion3D
added icons
cleanup
Merge branch 'subdivision'
Removed some leftover intentional breakage