add some color utilities
make the different mods alternate between shaded and unshaded, per suggestion

git-svn-id: svn://svn.icculus.org/fs2open/trunk@10547 387891d4-d844-0410-90c0-e4c51a9137d3
Remove gcc warnings (unused)

git-svn-id: svn://svn.icculus.org/fs2open/trunk@10548 387891d4-d844-0410-90c0-e4c51a9137d3