Removed Angel mathematical toolbox.
Added GLM math library. Added vertexBuffer and normalBuffer attributes into the group struct.
Vertex and normal uploading in now done into separate buffers, instead of subbuffers.
Replaced Angel mathematical library with GLM library http://glm.g-truc.net/. Lots of things to be fixed yet.
New class that reads, compiles and links GLSL shader files.
Removed old shader files
Added new shaders