Use 'wsgicors' for CORS handling.
The CW CORS handling (in web/cors.py) is only able to work on cubicweb requests.
When a request is not handled by bwcompat, we need a proper solution.
The `wsgicors` library provides what we need as a wsgi middleware.
Handle '__setauthcookie'
'__setauthcookie' is a form parameter added by the 'rememberme' cube.
If present and equals to '1', the cookie max_age will be set to 7 days instead
of being a session cookie.
To make sure the auth cookie is renewed, the reissue_time is set to 1h.