[IMP] mail, account, sale: improve sales order mail link

Mail now can handles a generic access_token in /mail/view route. Mail does
not do anything with it. Addons can override the controller and add their
specific management of this token according to some specific business
logic.

Sale order emails now contains the access token to grant access from the
notification email url without logging in. Sale portal now allow customers
to log in using an access token without having to use Online Quote. If
the user doesn't have an account yet and signup is allowed (B2C) an extra
parameter is added to the url to link the correct partner to the user upon
signup. If the user already has an account an extra parameter is added to
auto-fill the user's login if he wants to login from that session.

Account is also updated to prepare accepting access tokens. However the
complete implementation of accounting customer portal will be done in
another task coming soon.

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