Adds new ammo effects, new rocket launchers, new gunmods, and new gunmod recipes.

three new types of ammo effects for large scale destruction - EXPLOSIVE_HUGE, SMOKE_BIG, and NAPALM_BIG
M3 reloadable multipurpose rocket launcher - three types of ammo
M202 reloadable incendiary rocket launcher - one type of ammo
masterkey underbarrel pump shotgun gunmod
homebrew 40mm pipe launcher gunmod
recipes for extant double barrel sawed off underbarrel gunmod and new homebrew underbarrel 40mm gunmod
also renames 'Packed M72 LAW' to 'packed M72 LAW' and 'A7 Laser Rifle' to 'A7 laser rifle'