Spotifywebapipython

* Updated `ImageObject.GetImageHighestResolution` method to account for null width values.

* Correctly Updated various methods that return an ImageUrl property to return the highest resolution image from the Images collection instead of the first image. For some reason, the Spotify Web API sets the first Images collection image to the lowest resolution (e.g. 64x64); for all other Images, the highest resolution image is listed first (e.g. 640x640).

* Updated various methods that return an ImageUrl property to return the highest resolution image from the Images collection instead of the first image. For some reason, the Spotify Web API sets the first Images collection image to the lowest resolution (e.g. 64x64); for all other Images, the highest resolution image is listed first (e.g. 640x640).

* Updated `SpotifyClient.RemoveShowFavorites` method to account for Spotify Web API changes to remove show favorites.
* Updated `SpotifyClient.SaveShowFavorites` method to account for Spotify Web API changes to save show favorites.
* Updated `SpotifyClient.CheckPlaylistFollowers` method to account for Spotify Web API changes to `userIds` argument, which is now deprecated. A single item list containing current user's Spotify Username must now be used.

* Fixed various python `SyntaxWarning: invalid escape sequence '\ '` warnings that were being generated when code was executed. Something changed with Home Assistant recently that turned these "used to be ignored" warnings into actual warnings that wind up in the HA System Log! This is due to invalid escaped characters in various string comments that are used for documentation purposes (e.g. """ this is a code comment """).

* Updated Spotify Connect device processing to only require the userid and password parameters when authenticating to devices that require user and password values. Some devices only require a loginid value (e.g. spotifyd, Spotify Connect AddOn, librespot, Sonos, etc). The user should not have to specify userid and password values if they are not required!
* Cleaned up some documentation, as well as some of the code examples.