🎨 Improved internal manager storage

- Stored pipeline managers in a set
- Renamed store method to enable_manager_in_pipeline
- Simplified a bit the ugly code™ in details_window

src/main.py

@@ -92,8 +92,7 @@ class CartridgesApplication(Adw.Application):
         shared.store.add_manager(SteamAPIManager())
         shared.store.add_manager(OnlineCoverManager())
         shared.store.add_manager(SGDBManager())
-
-        shared.store.manager_to_pipeline(FileManager)
+        shared.store.enable_manager_in_pipelines(FileManager)
 
         # Create actions
         self.create_actions(