Building completion and unit training sounds are now ubiquitous, meaning you'll hear them even if they are off-screen.



git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13449 3db68df2-c116-0410-a063-a993310a9797
Converts a bunch of stereo sound effects to mono, to fix sounds ignoring entity position, fixes #1956, refs #1929.
Will require sound group XML updates in some cases.

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13450 3db68df2-c116-0410-a063-a993310a9797
Sets Distanceless flag on most selection sound groups.
Adds new sound groups for gates.

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13451 3db68df2-c116-0410-a063-a993310a9797
Merge remote-tracking branch 'remotes/trunk'