Refactor Templates to Layouts, Review and Cleanup

- Fix tgogenerator
- Fix UI for ForceGroup and Layouts
- Fix ammo depot handling
- Split bigger files in smaller meaningful files (TGO, layouts, forces)
- Renamed Template to Layout
- Renamed GroundGroup to TheaterGroup and GroundUnit to TheaterUnit
- Reorganize Layouts and UnitGroups to a ArmedForces class and ForceGroup similar to the AirWing and Squadron
- Reworded the UnitClass, GroupRole, GroupTask (adopted to PEP8) and reworked the connection from Role and Task
- added comments
- added missing unit classes
- added temp workaround for missing classes
- add repariable property to TheaterUnit
- Review and Cleanup

Added serialization for loaded templates

Loading the templates from the .miz files takes a lot of computation time and in the future there will be more templates added to the system. Therefore a local pickle serialization for the loaded templates was re-added:
- The pickle will be created the first time the TemplateLoader will be accessed
- Pickle is stored in Liberation SaveDir
- Added UI option to (re-)import templates

game/factions/factionloader.py

@@ -0,0 +1,54 @@
+from __future__ import annotations
+import json
+import logging
+from pathlib import Path
+from typing import Dict, Iterator, List, Optional, Type
+
+from game import persistency
+from game.factions.faction import Faction
+
+FACTION_DIRECTORY = Path("./resources/factions/")
+
+
+class FactionLoader:
+    def __init__(self) -> None:
+        self._factions: Optional[Dict[str, Faction]] = None
+
+    @property
+    def factions(self) -> Dict[str, Faction]:
+        self.initialize()
+        assert self._factions is not None
+        return self._factions
+
+    def initialize(self) -> None:
+        if self._factions is None:
+            self._factions = self.load_factions()
+
+    @staticmethod
+    def find_faction_files_in(path: Path) -> List[Path]:
+        return [f for f in path.glob("*.json") if f.is_file()]
+
+    @classmethod
+    def load_factions(cls: Type[FactionLoader]) -> Dict[str, Faction]:
+        user_faction_path = Path(persistency.base_path()) / "Liberation/Factions"
+        files = cls.find_faction_files_in(
+            FACTION_DIRECTORY
+        ) + cls.find_faction_files_in(user_faction_path)
+        factions = {}
+
+        for f in files:
+            try:
+                with f.open("r", encoding="utf-8") as fdata:
+                    data = json.load(fdata)
+                    factions[data["name"]] = Faction.from_json(data)
+                    logging.info("Loaded faction : " + str(f))
+            except Exception:
+                logging.exception(f"Unable to load faction : {f}")
+
+        return factions
+
+    def __getitem__(self, name: str) -> Faction:
+        return self.factions[name]
+
+    def __iter__(self) -> Iterator[str]:
+        return iter(self.factions.keys())