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Add an emailuser web notification

Authored by Umherirrender.

Description

Add an emailuser web notification

When an user sent an email to another user with [[Special:Emailuser]] or
action=emailuser, give an echo for the target user to be lookup in his
mailbox.
This option is off by default. It is only useful as web notification,
because an email notification would go to the same address.

Bug: T56130
Change-Id: Ie279457daf51e1c34c998197ce9e76c78ee705e4