Army weapons

So I felt like adding some of the mysteriously missing us military weapons. This adds:

-Beretta m9
-H&K 416A5
-M27IAR
-M14 EBR-RI
-M2010 ESR

I also played with the spawn numbers to make m4a1s more common in Fema-camps/bunkers.

Better descriptions for the guns are welcome, I am pretty bad at writing those.