Xbox-webapi-ex

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* Removed python-dateutil dependency
* Add auth-via-browser fallback script
* Small changes

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* Auth: Updated 2FA authentication to meet current windows live auth flow
* Auth: Redesigned 2FA authentication procedure
* Auth: Implemented xbox-auth-ui script (xbox.webapi.scripts.tui: urwid terminal ui)
* Auth: For password masking, getpass instead or raw input() is used
* Scripts: Default to appdirs.user_data_dir if no tokenfile provided via cmdline argument (see README)

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* Extend **Gameclips** provider with title id filtering and saved clips
* Add **Screenshots** provider
* Add **Titlehub** provider

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* Added **Userstats** endpoint
* Updated README

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* Support supplying auth credentials via stdin
* Added tests for all endpoints
* Added tests for authentication
* Added **QCS** endpoint
* Added **Profile** endpoint
* Added **Achievements** endpoint
* Added **Usersearch** endpoint
* Added **Gameclips** endpoint
* Added **People** endpoint
* Added **Presence** endpoint
* Added **Message** endpoint
* Removed **Gamerpics** endpoint

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* Metadata changes