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
Add generic error support for QGL_Init
Corrected symlinks in mac frameworks.
Add QGL_EGL alongside QGL_WGL and QGL_GLX
Change depth texture format to unsigned for GLES

TODO: Add depth24 check in this place.
GL_OES_depth24 initial bits
Reset sscanf version in R_FinalizeGLExtensions
Merge pull request #86 from vkni/master

Corrected symlinks in mac frameworks.
Corrected XCode project file. Added corrections related to OSX.