Decoupling and generalization of templates

Improvement for factions and templates which will allow decoupling of the templates from the actual units
- Implement UnitGroup class which matches unit_types and possible templates as the needed abstraction layer for decoupling.
- Refactor UnitType, Add ShipUnitType and all ships we currently use
- Remove serialized template.json and migrated to multiple yaml templates (one for each template) and multiple .miz
- Reorganized a lot of templates and started with generalization of many types (AAA, Flak, SHORAD, Navy)
- Fixed a lot of bugs from the previous reworks (group name generation, strike targets...)
- Reorganized the faction file completly. removed redundant lists, added presets for complex groups / families of units like sams
- Reworked the building template handling. Some templates are unused like "village"
- Reworked how groups from templates can be merged again for the dcs group creation (e.g. the skynet plugin requires them to be in the same group)
- Allow to define alternative tasks

tests/resources/valid_faction.json

@@ -52,18 +52,9 @@
   "sams": [
     "HawkGenerator"
   ],
-  "aircraft_carrier": [
-    "Stennis"
-  ],
-  "helicopter_carrier": [
-    "LHA_Tarawa"
-  ],
-  "destroyers": [
-    "PERRY",
-    "USS_Arleigh_Burke_IIa"
-  ],
-  "cruisers": [
-    "TICONDEROG"
+  "naval_units": [
+    "LHA-1 Tarawa",
+    "CVN-74 John C. Stennis"
   ],
   "requirements": {"mod": "Some mod is required"},
   "carrier_names": [
@@ -79,10 +70,6 @@
     "LHA-4 Nassau",
     "LHA-5 Peleliu"
   ],
-  "navy_generators": [
-    "OliverHazardPerryGroupGenerator",
-    "ArleighBurkeGroupGenerator"
-  ],
   "has_jtac": true,
   "jtac_unit": "MQ_9_Reaper"
 }