Save complete tracks and albums to the db for faster startup

- refactor function locations
- add logger
- check for new tracks instead of re-processing all files

server/app/db/tracks.py

@@ -31,7 +31,7 @@ class AllSongs(db.Mongo):
         },
                                           upsert=True).upserted_id
 
-    def get_all_songs(self) -> list:
+    def get_all_tracks(self) -> list:
         """
         Returns all tracks in the database.
         """