Rebalance gunplay#32219

MP5, Custom SMG, Thompson:
slightly reduce aimcone, change recoil pattern to one that could be controlled
LR-300:
change recoil pattern to one that could be controlled
M249, HMLMG:
massively reduce aimcone, after all the M2 is supposed to be the best gun in the game, but in it’s current state it isn’t