WebAPI V2

[hunterjm]

This is a working draft for a major version increment based off of #17, except it adds true OAuth2 support instead of web scraping for authentication.

To test, register a new application in Azure AD and add http://localhost:8080/auth/callback as a redirect URL. Then generate a client secret. Set CLIENT_ID and CLIENT_SECRET env vars and run xbox-authenticate.

To do:

• [x] ms_cv integration (maybe optional kwarg no_cll_vec: bool for Session.request
• [x] Add RequestSigner / SignedSession
• [x] Implement Store endpoint
• [x] Fix message endpoint
• [x] Test all the endpoints for validity (automate too)
• [x] Argument parser for xbox-authenticate script
• [x] Fix xbox-searchlive
• [x] Add Smartglass endpoint (xccs)
• [x] Tests for authentication
• [x] Edit README and docs to reflect new API and OAuth setup
• [ ] Bump to 2.0.0
• [ ] Pin other OpenXbox libs to 1.x

[hunterjm]

To keep it simple, I removed support for saving tokens to file for now. I will add that back in later.

[hunterjm]

Cherry picked @tuxuser work on vcrpy conversion and will start converting tests.

[hunterjm]

Note: We still haven't converted the lists endpoints, and don't have tests for them either.

[tuxuser]

edit - moved TODO to the top so we can edit and check off/add others as we go without losing it.