Prevent formation controllers from showing up in range queries. Fixes #1796.

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13484 3db68df2-c116-0410-a063-a993310a9797
Fixes build with x11 and SDL2

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13485 3db68df2-c116-0410-a063-a993310a9797
add restricted flag to SoundGroup xml for sounds thatonly the owning player should hear

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13486 3db68df2-c116-0410-a063-a993310a9797
change 'restricted' flag to 'heardby' in SoundGroup xml files 

git-svn-id: http://svn.wildfiregames.com/public/ps/trunk@13487 3db68df2-c116-0410-a063-a993310a9797
Merge remote-tracking branch 'remotes/trunk'