Updates for WW2 loadouts.

Major changes:
 - FW190A8 ground attack loadout WGr21 rockets (primarily an air-to-air weapon) replaced with SC500J or AB500 bombs.
 - FW190D9 WGr21 rockets replaced with R4M rocket packs and SC500 bombs for CAS.
 - Added droptanks for I-16.
 - Ju-88A4 CAS loadout changed for AB500 cluster bombs.
 - Mosquito now has rockets which were introduced in DCS World 2.7.9.17830 open beta
 - Added more/heavier bombs to P-47
 - P-51 now has a separate OCA/Runway loadout with bombs. Other ground attack loadouts switched to rockets.

Also includes an SA342Minigun loadout which we didn't previously have.

resources/customized_payloads/SA342Minigun.lua

@@ -0,0 +1,34 @@
+local unitPayloads = {
+	["name"] = "SA342Minigun",
+	["payloads"] = {
+		[1] = {
+			["name"] = "Liberation CAS",
+			["pylons"] = {
+				[1] = {
+					["CLSID"] = "{IR_Deflector}",
+					["num"] = 6,
+				},
+			},
+			["tasks"] = {
+				[1] = 31,
+			},
+		},
+		[2] = {
+			["displayName"] = "Liberation OCA/Aircraft",
+			["name"] = "Liberation OCA/Aircraft",
+			["pylons"] = {
+				[1] = {
+					["CLSID"] = "{IR_Deflector}",
+					["num"] = 6,
+				},
+			},
+			["tasks"] = {
+				[1] = 31,
+			},
+		},
+	},
+	["tasks"] = {
+	},
+	["unitType"] = "SA342Minigun",
+}
+return unitPayloads