Use REST API for station list and allow sorting

[nabertrand]

Uses the REST API for the station list to allow sorting by lastPlayed and totalPlayTime.

Some implementation notes:

• There is no generic artUrl parameter for the stations, rather a list of varying sized art is provided. This chooses the first, which happens to be 90x90 pixels. 130x130, 500x500, 640x640 and 1080x1080 are also available.
• The 'QuickMix' station is called 'Shuffle' in the REST API. We could override the name back to QuickMix if desired.
• stationName becomes name in the station hash
• The REST API defaults to sorting by 'recently played', but the JSON API appears to default to 'recently created'. This sets the default to 'recently played', but we could set it to 'recently created' if desired.
• The REST API paginates results. This fetches 250 stations at a time, but that number could be altered if desired.
• The REST API station list does not include the QuickMix station, so it must be fetched separately.
• There doesn't appear to be the concept of stationToken in the REST API, so the stationId => stationToken mapping was removed.
• The 'Shuffle' station can be disabled from appearing in the list in the settings.

[sspiff]

Thanks! I'll review and we'll get this merged in. Okay with me to drop the "hide shuffle/quickmix station" function if it complicates it.

[nabertrand]

Thanks! I'll review and we'll get this merged in. Okay with me to drop the "hide shuffle/quickmix station" function if it complicates it.

I think I got all the logic fixed to accommodate disabling the QuickMix station

[sspiff]

Thanks @nabertrand !