Updated: README.md with project description and disclaimer
Merge CopperLicht API functions from branch 'tutorial'
Merge TriangleSelector classes from branch 'tutorial'
Merged per-frame rendering callbacks and fixes from branch 'tutorial'
Added: SceneNode API functions
Added: API functions to get a 3D point from the intersection with a canvas pixel
Added: Overlay2DSceneNode + updates to Triangle3d and Vect3d API
Added: removeChild API method to SceneNode
Merge API additions from branch 'master' into tutorial