Fuel drain, 40HMG weight, removed mp3s

-Fuel is now drained from all active tanks, instead of sequentially
-Slightly nerfed 4.1L i5 diesel torque
-Dropped 40mm HMG weight from 960 to 600, increased mag size from 30 to
35
-MG/HMG recoloring fixed
-Removed a few redundant sounds