Add support for AH-64D_BLK_II as PyDCS Extension

The new human flyable Apache will be handled like a mod in 5.X to be save compat and to prevent switching to the newest version of pydcs. There will no checkbox on the newgame wizard like with other mods as it can be used by everyone.

- exported the AH-64D_BLK_II and the weapon data from the latest open beta
- added the needed ressources
- maked the AH-64D_BLK_II as flyable

resources/units/aircraft/AH-64D.yaml

@@ -15,4 +15,4 @@ origin: USA
 price: 20
 role: Attack
 variants:
-  AH-64D Apache Longbow: {}
+  AH-64D Apache Longbow (AI): {}

resources/units/aircraft/AH-64D_BLK_II.yaml

@@ -0,0 +1,18 @@
+always_keeps_gun: true
+description: The legendary 'Apache' is an US twin-turboshaft attack helicopter for
+  a crew of two. It features a nose-mounted sensor suite for target acquisition and
+  night vision systems. It is armed with a 30 mm (1.18 in) M230 chain gun carried
+  between the main landing gear, under the aircraft's forward fuselage, and four hardpoints
+  mounted on stub-wing pylons for carrying armament and stores, typically a mixture
+  of AGM-114 Hellfire missiles and Hydra 70 rocket pods. The AH-64 has significant
+  systems redundancy to improve combat survivability. American AH-64s have served
+  in conflicts in Panama, the Persian Gulf, Kosovo, Afghanistan, and Iraq. Israel
+  used the Apache in its military conflicts in Lebanon and the Gaza Strip. British
+  and Dutch Apaches have seen deployments in wars in Afghanistan and Iraq.
+introduced: 2003
+manufacturer: Boeing
+origin: USA
+price: 20
+role: Attack
+variants:
+  AH-64D Apache Longbow: {}