roll back r10806 because 1) all callers to this function have names which are MAX_FILENAME_LEN in size; and 2) the memset already sets all characters to 0, so there's no need to add a null terminator

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10857 387891d4-d844-0410-90c0-e4c51a9137d3
fix a bug introduced by r10837: 0 is a valid path index

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10858 387891d4-d844-0410-90c0-e4c51a9137d3
fix a bug introduced by r10852: MAX_OBJECTS is not a valid object index

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10859 387891d4-d844-0410-90c0-e4c51a9137d3
Fix a range of issue identified via clang warnings

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10860 387891d4-d844-0410-90c0-e4c51a9137d3
Address Clang warnings are overloaded virtual functions in UI_GADET. Also opportunity to simplify code by making the most of inherited polymorphism. Docs cleanup

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10861 387891d4-d844-0410-90c0-e4c51a9137d3
Quieten a number of warnings related to UI_USERBOX without a declaration yet. Added TODO.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10862 387891d4-d844-0410-90c0-e4c51a9137d3
MageKing17's patch for callsigns not resetting when the mission is cleared (Mantis #2934)

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10863 387891d4-d844-0410-90c0-e4c51a9137d3
from MageKing17: choose alt_names and callsigns by array index instead of substring; fixes Mantis #2934

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10864 387891d4-d844-0410-90c0-e4c51a9137d3
Yarn's fix for Mantis #2362 (scale images properly with show-subtitle-image)

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10865 387891d4-d844-0410-90c0-e4c51a9137d3
Remove a tautological Assert(), which cannot be triggered due to the type

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10866 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Clang warnings about incorrect type given different pointer sizes for the architecture. Use the standard compliant ptrdiff_t

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10867 387891d4-d844-0410-90c0-e4c51a9137d3
Fix Mantis #3070, courtesy of Yarn.

git-svn-id: svn://svn.icculus.org/fs2open/trunk/fs2_open@10868 387891d4-d844-0410-90c0-e4c51a9137d3
Add mainhall.tbl cheats and "+Misc anim over doors"
Fix animation glitch during swapping (for cheats)