🎨 Made manager attributes more flexible

Changed run_after, retryable_on and continue_on to be type Container.
We don't need them to be sets.

The performance gain of sets over small tuples is nonexistant
for in checks and the  syntax is more verbose.

src/store/managers/display_manager.py

@@ -8,7 +8,7 @@ from src.store.managers.manager import Manager
 class DisplayManager(Manager):
     """Manager in charge of adding a game to the UI"""
 
-    run_after = set((SteamAPIManager, SGDBManager))
+    run_after = (SteamAPIManager, SGDBManager)
 
     def manager_logic(self, game: Game, _additional_data: dict) -> None:
         # TODO decouple a game from its widget