Use Profile instead of User and (if we know it) send along the target
profile, so a Diaspora plugin can encrypt to the receiver.

This means we can handle DeleteNoticeAsProfile in plugins, such as
the ActivityModeration plugin.

Let's now create an event called DeleteNotice and also make sure we
handle the onNoticeDeleteRelated properly in ActivityModeration to
avoid possible endless loops etc.

Add addPlugin('StoreRemoteMedia'); in your config.php to enable.

Also prepares for StoreRemoteMediaPlugin, coming up...

This reverts commit 1864a9de.

The problem was another label that was missing (fixed in previous commit, the close button)

Apparently it read as "times" in screen readers.