reworked the skynet group name generation

- added information about the role of the aa site
- moved handling of ground name from tgo to the sam generator to make the tgo cleaner
- adjusted the skynet-config lua to the changes

game/game.py

@@ -483,7 +483,7 @@ class Game:
         self.current_unit_id += 1
         return self.current_unit_id
 
-    def next_group_id(self):
+    def next_group_id(self) -> int:
         """
         Next unit id for pre-generated units
         """