Revert "Revert "Migrate buildings and TGOs to unit map.""

With fixed tracking for TGO groups and fortification "buildings".

Fixes https://github.com/Khopa/dcs_liberation/issues/485

This reverts commit 72ac8ca872.

game/operation/operation.py

@@ -265,7 +265,8 @@ class Operation:
             cls.current_mission,
             cls.game,
             cls.radio_registry,
-            cls.tacan_registry
+            cls.tacan_registry,
+            cls.unit_map
         )
         cls.groundobjectgen.generate()