Release Name: 0.50.0

Notes:
* GLU cleanup, update and fixes
* GLUT cleanup, update and fixes
* Added support for numerous extensions
* Some new examples and code cleanup
* Pixelpack/unpack buffer support (OpenGL 2.1 feature)
* Pixelpack/unpack buffer support (OpenGL 2.1 feature)
* Some refactoring to remove code duplicity
* Many bugfixes.



Changes: