- remove non-free shaderlab exception
  there is no shaderlab's file anymore
- remove non-GPL code from Wolf:ET source tree exception
  it was basically unzip, zlib, md4, jpeg, curl, ft2, and png
  they are now external.
- add sgame/sg_api.cpp as BSD licensed exception
- do not talk redirect to CC file, it's not there anymore
  keep the url