Fixes, balance, sounds

-Added looter's fix for missing sound lag on guns
-Added _Beckett's recolorable mortar models
-Added Cre8or's fixed/updated rotor sounds
-Added Cre8or's new sounds, including missiles, alarms, rotors, engines,
+more
-New GL and SL sounds, courtesy of Cre8or
-Moved energy weapon sounds to acf extras folder
-Removed some duplicate sounds
-120mm SC weight dropped from 4.2 tons to 3.8 tons
-140mm SC weight dropped from 7 tons to 6 tons
-Slightly normalized HE damage with respect to ductility