Fix for Mantis #2806 - added option to rotate the turrets according to 'initial' state animation code in the lab - option enabled by default but can be toggled via render options

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10022 387891d4-d844-0410-90c0-e4c51a9137d3