TVmaze Plex Agent (based on srob650's)

• Added support for cast with character photo (fallback to actor photo)
• Added support for episode thumbnails
• Added show's status (Running, Ended, Cancelled, etc) in content rating as TVmaze doesn't provide content rating (TV-MA, TV-14, etc)
• Renamed all instances of TVMaze to TVmaze as per TVmaze's brand guidelines
• Removed all instances of medium images as the original will always be there if the medium exist.