Added attachment to the 2 gatling-based gun in the game, the Vulcan Minigun & XL 5.56

• XL 5.56
  added bigger multi-barrel that greatly boost damage and accuracy, at the cost of reduced movement speed.

• Vulcan Minigun
  added smaller multi-barrel that "converts" the firing sound of a minigun to almost sounds like a rapid contruction tool noise, effectively suppressing the gun! Firing it near someone will still alert them tho.
  added "Double my Order Kit", doubling your starting round count for that really long engagement.

PD2 skin support: texture and code

Thanks to carl ruins everything's help on retexturing the double kit!

As Always,

Requires BeardLib
Requires WeaponLib

> Put in "mod_overrides" folder

Known Issue: