Ppreprocessor statements in shaders.
Switching all the fragment shaders to use the #ifplatform switch
Guard skewing code in the shaders with a #ifdef SKEW_GEOMETRY
Combining skew/not-skew and pixel-lighting/vertex-lighting into a single shader.
Merge pull request #44 from VajraFramework/ifdefs_in_shaders

Ppreprocessor statements in shaders.