- Fixed: Don't transform map variable string initializers into global string table entries if
  they don't really exist in the source string table.

git-svn-id: http://mancubus.net/svn/hosted/zdoom/zdoom/trunk@4321 a95907f1-e10c-0410-b46f-9e587ccb1026
- Fixed: When garbage collecting ACS strings, the active values on the ACS stack also need
  to be included in the mark phase.

git-svn-id: http://mancubus.net/svn/hosted/zdoom/zdoom/trunk@4322 a95907f1-e10c-0410-b46f-9e587ccb1026
- Added ACS function PlayActorSound. It's functionally equivalent to PlaySound, except instead
  of taking an actual sound name as its second parameter, it selects the sound to play based on
  the actor playing the sound and the selector passed as the second parameter.

git-svn-id: http://mancubus.net/svn/hosted/zdoom/zdoom/trunk@4323 a95907f1-e10c-0410-b46f-9e587ccb1026