🎨 Various changes

- Changed source additional data to dict
- Moved local cover saving into a manager
- Added stub for itch cover manager

src/store/managers/local_cover_manager.py

@@ -0,0 +1,23 @@
+from pathlib import Path
+
+from src.game import Game
+from src.store.managers.manager import Manager
+from src.store.managers.steam_api_manager import SteamAPIManager
+from src.utils.save_cover import save_cover, resize_cover
+
+
+class LocalCoverManager(Manager):
+    """Manager in charge of adding the local cover image of the game"""
+
+    run_after = set((SteamAPIManager,))
+
+    def manager_logic(self, game: Game, additional_data: dict) -> None:
+        # Ensure that the cover path is in the additional data
+        try:
+            image_path: Path = additional_data["local_image_path"]
+        except KeyError:
+            return
+        if not image_path.is_file():
+            return
+        # Save the image
+        save_cover(game.game_id, resize_cover(image_path))