Changed launch behaviour
New there is an option menu to either launch or close the server.
Re: server shutdown, changed output to console to be more informative
Added save method to write quiz list data to default directory.
The method is implemented whent the server is shutdown.
Added constructor that takes existing list of quizzes
Added method to load existing quiz server data, if it exists.
Added message advising whether new/saved server has been launched
Suppressed warnings re casting from saved object.