- fixed signed-ness issue with FloatBobPhase.


git-svn-id: http://mancubus.net/svn/hosted/zdoom/zdoom/trunk@4310 a95907f1-e10c-0410-b46f-9e587ccb1026
- Added more string functions to ACS:
  * The standard C functions strcmp and stricmp (aka strcasecmp), which double up as strncmp and strnicmp if you pass a third argument.
  * The BASIC-like functions strleft, strright, and strmid, which extract parts of a string to
    create a new string.

git-svn-id: http://mancubus.net/svn/hosted/zdoom/zdoom/trunk@4313 a95907f1-e10c-0410-b46f-9e587ccb1026
- Clean up excess code around a few calls to SingleActorFromTID(), since that function is already
  designed specifically to handle the case where tid is 0.

git-svn-id: http://mancubus.net/svn/hosted/zdoom/zdoom/trunk@4315 a95907f1-e10c-0410-b46f-9e587ccb1026
- Added GetActorClass and GetWeapon functions to ACS.

git-svn-id: http://mancubus.net/svn/hosted/zdoom/zdoom/trunk@4316 a95907f1-e10c-0410-b46f-9e587ccb1026
- Added S_ChangeSoundVolume() to change the volume of an already playing sound, accessible
  through the new ACS function SoundVolume.

git-svn-id: http://mancubus.net/svn/hosted/zdoom/zdoom/trunk@4318 a95907f1-e10c-0410-b46f-9e587ccb1026