Project Osiris v1.0.3

Hi! Another update for you, some minor bugfixes, but mainly I got permission from Bjorn Lynne to include the CD32 music in the package, so no more fiddling around with music files and pk3s!

Changelog

• Gamma option in the new menu now works
• Set default sector light mode in DEFCVARs to Doom, and activated shadowmaps
• Ending map now has the correct music when using the CD32 soundtrack
• CD32 music is now included in the main package, thanks Bjorn Lynne for permission to include the music!