Refactored TVShow class to use get_episode instead of calling TVEpisode class directly when populating shows episode cache.
Removed type hints for now, will make a project of adding type hints later on.
Refactored ajax calls for episode search status to always pass a series ID.

Refactored episodes attribute on TVShow objects to cache TVEpisode objects and persist.
Refactored usage and removed get_all_episodes method from TVShow class.
Refactored total show size to account for multipart-episodes.
Added delete_episode method to TVShow class to remove episode from shows episode cache.
Refactored usage of TVEpisode class method delete_episode to be called by TVShow method delete_episode instead of directly.
Fixed endpoint call for getting annoucements from SR API.

Refactored TVShow and TVEpisode objects to store changes to their local data container, calling save method will update database with data from local container, helps prevent database lock issues.

Added call to save episode data to database after saving episode thumbnail, fixes a database locked issue.