Fix for Mantis 3015: Makes sure rotation values are always in the 0-359 degree range


git-svn-id: svn://svn.icculus.org/fs2open@10518 387891d4-d844-0410-90c0-e4c51a9137d3
Fix for Mantis 3023 by Yarn: Make sure the vasudan mainhall fun cheat works again


git-svn-id: svn://svn.icculus.org/fs2open@10519 387891d4-d844-0410-90c0-e4c51a9137d3