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

resources/layouts/buildings/fob1.yaml

@@ -0,0 +1,31 @@
+name: fob1
+generic: true
+role: Building
+tasks:
+  - FOB
+groups:
+  - name: fob1 0
+    statics:
+      - fob1 0-0
+    unit_count:
+      - 1
+    unit_types:
+      - .Command Center
+  - name: fob1 1
+    statics:
+      - fob1 1-0
+      - fob1 1-1
+      - fob1 1-2
+    unit_count:
+      - 3
+    unit_types:
+      - Barracks 2
+  - name: fob1 2
+    statics:
+      - fob1 2-0
+      - fob1 2-1
+    unit_count:
+      - 2
+    unit_types:
+      - Garage small B
+layout_file: resources/layouts/buildings/buildings.miz