only apply hw gamma ramps where and when needed
fixed the start-up console window staying visible when starting in full-screen
black window background to avoid the white flashes when hw gamma is enabled
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
