Merge pull request #10 from Narann/master

Code cleanup.
remove OGL 1.4V2
as fog coordinate array is supposed to be part of OGL1.4, we consider it as always present and remove any code that deal without it
As GL_ARB_mutitexture is part of OGL1.3 I removed every part of the code that doesnt considere it as default and update to remove ARB suffixes.
remove GL_ARB_texture_env_combine and GL_EXT_texture_env_combine checks and consider them always true as they both are part of OGL1.3, also clean the constant names