Spotifywebapipython

* Updated `SpotifyClient`, `ZeroconfConnect`, and `AuthClient` class constructors to include the `tokenStorageFile` argument that specifies the filename and extension of the authorization Token Cache file. This is used for Spotify Connect devices that utilize the `authorization_code` token type.

* Updated `SpotifyClient.RemoveAudiobookFavorites` method to make the `ids` argument optional; if not supplied, the currently playing audiobook id value is used instead.
* Updated `SpotifyClient.RemoveEpisodeFavorites` method to make the `ids` argument optional; if not supplied, the currently playing episode id value is used instead.
* Updated `SpotifyClient.RemoveShowFavorites` method to make the `ids` argument optional; if not supplied, the currently playing show id value is used instead.
* Updated `SpotifyClient.SaveAudiobookFavorites` method to make the `ids` argument optional; if not supplied, the currently playing audiobook id value is used instead.
* Updated `SpotifyClient.SaveEpisodeFavorites` method to make the `ids` argument optional; if not supplied, the currently playing episode id value is used instead.
* Updated `SpotifyClient.SaveShowFavorites` method to make the `ids` argument optional; if not supplied, the currently playing show id value is used instead.

* Updated `SpotifyClient.PlayerTransferPlayback` method to default the `refreshDeviceList` argument to True so that the Spotify Connect device list is refreshed by default before transferring playback.
* Updated `ZeroconfConnect` methods to use `connection:close` headers for requests to the Spotify Connect Zeroconf API endpoints.

* Updated `SpotifyClient.GetSpotifyConnectDevice` method to check if a Spotify Desktop Client Application OAuth2 token exists when a PlayerTransfer targets a Sonos device. If not found, then control will be transferred to the Sonos device using it's local queue; if found, then Spotify Connect will reconnect to the device and control will be transferred to the Sonos device using Spotify Connect.

* Updated `SpotifyClient.GetSpotifyConnectDevice` method to get real-time information for some portions of the device info for devices detected by zeroconf discovery (non-dynamic), even when using the cache. Prior to this fix, transfer of playback failed for dynamic devices (web player, mobile app player, etc).

* Updated `SpotifyClient.GetSpotifyConnectDevice` method to get real-time information for some portions of the device info, even when using the cache. Prior to this, stale information was being used that had been updated since the last cache update.