Revert "Rough working of Raytracer refactor."

This reverts commit ea22a714c67c0ed1407ca633eacd59fd33c6a82e.
Most of libst removed from Raytracer
Added MultMat4 functions to GLMExtensions.
In middle of GLM refactor. Replacing Mults
In middle of replacing Mults.
In middle of replacing Mults.
Moved most of libst out of Raytracer.
Factored out STImage use in Raytracer to PixelArray.
Moved Makefile to top level. Moved examples scenes to top level.