allow sexps which reference sounds to use either the table index or the entry name as the reference (based on a patch by m!m, see http://www.hard-light.net/forums/index.php?topic=86293.0)

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@11106 387891d4-d844-0410-90c0-e4c51a9137d3
I forget who requested this, but this change now causes FRED to allow numeric sexps to be used for OPF_WEAPON_BANK_NUMBER

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@11107 387891d4-d844-0410-90c0-e4c51a9137d3
Parias's patch for Mantis #3102 (make show-subtitle-text positioning consistent on MP clients)

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@11108 387891d4-d844-0410-90c0-e4c51a9137d3
make flag checking more efficient and prevent an Int3() on bad data

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@11109 387891d4-d844-0410-90c0-e4c51a9137d3