for Mantis #2651: revert r10933, per forum discussion:
http://www.hard-light.net/forums/index.php?topic=88047.0

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10937 387891d4-d844-0410-90c0-e4c51a9137d3
for Mantis #2064: remove ship template feature which never worked without crashing

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10938 387891d4-d844-0410-90c0-e4c51a9137d3
some const-correctness in preparation for the Mantis #3071 patch

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10939 387891d4-d844-0410-90c0-e4c51a9137d3
use static casts to make our intentions clear and prevent compiler warnings

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10940 387891d4-d844-0410-90c0-e4c51a9137d3