tr_gl2.cpp now uses the proper interface for printing errors
tr_gl2.cpp now has function names that make sense
removed old references to GLimp_*
cleaned up prefixes in the Windows platform layer
use the "premake" tool from the cnq3tools repo with
"--quake3dir=<q3dir>" to generate a VS sln and gcc makefiles
this changeset also removes the "clever" handling of fullscreen/windowed
changes which didn't actually work and just broke windowed mode
