Include i_music.h for r5156

git-svn-id: http://odamex.net/svn/root/trunk@5159 b0bcef46-2027-0410-bd56-ab726e9a1d04
- Disable classic coop scoreboard as it is broken, mark as TODO

git-svn-id: http://odamex.net/svn/root/trunk@5160 b0bcef46-2027-0410-bd56-ab726e9a1d04