Add a getFavoriteRadioStations() method

[vmichalak]

Get favorite radio stations.

[mguntli]

Please don't limit it to only radio stations, also playlists can be added to favorites.
How about "getFavorites" where each favorite entry has an identifier for the type?

Example command to get Favorites: Browse("FV:2")
https://github.com/jishi/Jishi.Intel.SonosUPnP/blob/master/Jishi.Intel.SonosUPnP/SonosPlayer.cs#L378

Note: Sonos renamed Favorites to "My Sonos" in their app.

[vmichalak]

I think i gonna follow the SoCo method for the library. A plugin system with a plugin for each platform.