Quart-auth

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* Require Quart >= 0.18
* Switch to GitHub rather than GitLab.

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* Support Python 3.10
* Add a basic_auth_required decorator.

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* Support authenticating WebSocket connections.
* Make testing with logged in users easier via a
test_client.authenticated context manager.
* Ensure wrapped routes are async.

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* Bugfix set domain when deleting auth cookie.
* Change the default SameSite from Strict to Lax.
* Change the default hashing algorithm to SHA512. This will invalidate
any existing cookies.
* Switch from setting expires to max age.
* Add a renew_login function, to renew the cookie expiry.
* Ensure cookies are deleted - by using the same samesite attribute as
configured.
* Require Quart >= 0.13

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* Add current_user as a template context - to allow its usage when
rendering templates.
* Introduce a Quart-Auth specific Unauthorized exception - to allow
specific actions when unauthorized requests are made e.g. redirects.

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* Loosen python version requirement - now requires Python >= 3.7.
* Ensure the current_user resolves to an Unauthenticated user on
logout.
* Refactor User classes remove AnnonymousUser and UserABC, use only
AuthUser.