Support for enable visiturl in autoconfiguration

Yandex requires enabling IMAP in the settings before it can be used and supports enable visiturl:

$ curl https://autoconfig.yandex.ru/mail/config-v1.1.xml
...
    <enable visiturl="https://mail.yandex.ru/neo2/#setup/client">
        <instruction>Check IMAP setting on</instruction>
        <instruction lang="ru">Включите настройку imap.yandex.com</instruction>
    </enable>
...

Displaying this URL with description in some form can help users find the setting.

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