Add Local File Cleanup to certain Auto-Upload types.

For auto-uploads of Pictures and Videos, it would be great if a local retention could be set, 30, 60, 90 days, 1-x years, etc... That way, local files would be cleaned up automatically. Right not, nextcloud either immediately deletes the file after upload or does nothing to it, making cleanup a manual process.

Adding cleanup logic to the nextcloud app makes it so we don't need to rely on another app for cleanup. Greatly enhancing ease of use for non-technical users.