Spotifywebapipython

* Added `SpotifyClient.IsAudiobookEpisode` method that returns true if the specified episode id is an audiobook chapter; otherwise, false. This allows you to programatically determine the difference between a podcast / show episode, and an audiobook episode.

* Updated `ZeroconfGetInfoAlias` to fix a bug related to Spotify Connect devices that define aliases (introduced with v1.0.93). This was causing `TypeError: unsupported operand type(s) for &: 'str' and 'tuple'` exceptions if a device had aliases defined.

* Added defensive code in various parsers to account for the Spotify Web API returning an invalid / incomplete object. This was noticed with the `GetAlbumFavorites` method, but also applied to other models that inherited from PageObject.

* Added `image_url` attribute value to all models that support a `ToDictionary()` method (some that were previously missed in 1.0.94 release).

* Added `image_url` attribute value to all models that support a `ToDictionary()` method.
* Miscellaneous documentation updates.

* Updated `SpotifyClient.GetAlbumFavorites` method to correctly sort results based upon the `sortResult` argument setting; true to sort by name ascending, false to sort by AddedAt descending.
* Updated `SpotifyClient.GetEpisodeFavorites` method to correctly sort results based upon the `sortResult` argument setting; true to sort by name ascending, false to sort by AddedAt descending.
* Updated `SpotifyClient.GetShowFavorites` method to correctly sort results based upon the `sortResult` argument setting; true to sort by name ascending, false to sort by AddedAt descending.
* Updated `SpotifyClient.GetTrackFavorites` method to correctly sort results based upon the `sortResult` argument setting; true to sort by name ascending, false to sort by AddedAt descending.