Add QGL_GetDriverInfo for systems without driver override
Change dllcvarname check to gl_driver check
Const qgl_driverinfo on Mac
Const qgl_driverinfo on Unix
Const qgl_driverinfo on Windows
Merge pull request #85 from SiPlus/gldriver

Add QGL_GetDriverInfo for systems without driver override
Fix angelwrap compiler warnings
Use mat3 instead of mat4 for ReflectionTexMatrix
u_LightstyleColor [4] -> [NUM_LIGHTMAPS]
u_GlossIntensity/Exponent -> u_GlossFactors
Typo
ALPHATEST -> QF_ALPHATEST
Move skinning to an external GLSL file
Post-processing doesn't need vtransform
Move instanced transformations to vtransform
Fix wrong variable name
Refactor ref_gl include guards
Add QGL_FUNC_OPT for optional GLES3 functions

Don't fail QGL_Init if the function was not found. This is for instanced
rendering, which is core GLES3 functionality, but we don't need it with
libGLES2.
Use sscanf instead of floats for GLSL version
Optimize rgbdepth, remove soft part viewport parm