[MP] Removed unused classes from tr_WorldEffects.h
Merge branch 'master' into rend2
[Rend2] glsl_shaders.cpp is now autogenerated.

Added a new target to the CMake files to pack all of the .glsl files in
the glsl/ folder into a single .cpp file. This will be automatically run
every time the rend2 library is built, and if any of the .glsl files have
changed.
[Rend2] Updated GLSL files for skeletal animation.