OpenGL shader code rearrangement and shader pre-preprocessor

src/CMakeLists.txt

src/Makefile

src/hardware/hw_batching.c

src/hardware/hw_defs.h

src/hardware/hw_drv.h

src/hardware/hw_glob.h

src/hardware/hw_main.c

src/hardware/hw_main.h

src/hardware/hw_md2.c

src/hardware/hw_shaders.c

src/hardware/r_opengl/r_opengl.c

src/hardware/r_opengl/r_opengl.h

src/sdl/Srb2SDL-vc10.vcxproj

src/sdl/Srb2SDL-vc10.vcxproj.filters

src/sdl/hwsym_sdl.c

src/sdl/i_video.c

src/w_wad.c