Implement OAuth2 user token autorefresh. #2039
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To use OAuth2 properly, an OAuth2UserHandler must be used instead of a vanilla requests.Session. A session= argument has been supplied to tweepy.Client for this purpose. Now, if the Client.session isn't a vanilla requests.Session, this session is used for all authentication. This is actually how oauth1 should be done too.
OAuth2UserHandler has been given two more arguments: auto_refresh and token_updater. It has also been given a classmethod, from_token(), for restoring an OAuth2UserHandler from old data.
This code does not rely on requests/requests-oauthlib#511 , but the documentation I wrote for this code does assume behaviour resulting from it.