Spotifywebapipython

* Updated `SpotifyClient` methods to add basic validation for required parameter values.

* Updated `SpotifyClient._CheckResponseForErrors` method to use json library to parse JSON response, instead of the urllib3 `HTTPResponse.json()` method. The urllib3 `HTTPResponse` class can return missing attributes and methods when processing redirects.

* Updated `SpotifyClient._CheckResponseForErrors` method with better logging information.

* Updated `SpotifyClient._CheckResponseForErrors` method with better logging information.

* Added `SpotifyClient.SetAuthTokenFromToken` method to allow the authorization token to be used from an existing OAuth2 token.
* Removed `SpotifyClient.SetAuthTokenFromSession` method in favor of the `SetAuthTokenFromToken` method.
* Updated scope processing to pass a space-delimited string of scopes instead of an array of strings. It appears that the Spotify Web API will accept both, but API documentation states that a space-delimited string is preferred.

* Updated `SpotifyClient.SetAuthTokenFromSession` method to correct a bug related to Home Assistant OAuth2Session object.