Patch By: Mate-86 Differential Revision: https://code.wildfiregames.com/D921 This was SVN commit r20236.
Patch by trompetin17, fixes #1712 This was SVN commit r15734.
Support sound group playback from simulation scripts. See #486. Update some sound group files to sound better for rough testing. Clean up CSoundGroup a tiny bit. This was SVN commit r7437.