Glow:- Debug, exported ClearErrors and CheckError.
- File, fixed loading of text files (broken in previous commit).
- Glow, check errors during initialisation.
Test01:- Updated shaders to be 3.30 compatible, rather than OpenGL ES 1.00 (not sure why I wrote it like that...)
- Renderer, fixed drawing as vbo was going out of scope.
- Main, create an OpenGL 3.3 context.