gun fix for f4f-3/4 and fm-2 wildcat

Provides six individual .50 caliber machine guns for the OH F4F Wildcat and four individual .50 caliber for the Allen F4F-3 and FM-2 Wildcats.Specialized "strafer" DP's are also included for the Wildcats as well as Allens F4U-1 and B24 Guy's F4U1-A. See the README for further details...