Moved the plex_userid to settings to expanded with functions for
updating and fetching settings, each with its own helper function
towards the database.
Since we had a linkPlexUserId function and we dont want plex_userid to
be updated from the updatesettings function we moved unlinking to a
separate endpoint and class function.
Also a new controller and endpoints for getting and updating settings.
KevinMidboe
f8847c62f2