[OpenGL-NeHe.NeHeLesson1] Update lesson to use latest version of unified API
[OpenGL-NeHe.NeHeLesson2] Update lesson to use latest version of unified API
[OpenGL-NeHe.NeHeLesson3] Update lesson to use latest version of unified API
[OpenGL-NeHe.NeHeLesson4] Update lesson to use latest version of unified API
[OpenGL-NeHe.NeHeLesson5] Update lesson to use latest version of unified API
[OpenGL-NeHe.NeHeLesson6] Update lesson to use latest version of unified API
[OpenGL-NeHe.NeHeLesson7] Update lesson to use latest version of unified API
[OpenGL-NeHe.NeHeLesson8] Update lesson to use latest version of unified API
[OpenGL-NeHe.NeHeLesson9] Update lesson to use latest version of unified API
[OpenGL-NeHe.NeHeLesson13] Update lesson to use latest version of unified API
[OpenGL-NeHe.NeHeLesson17] Update lesson to use latest version of unified API