Add signals to MailFolderCache for common events

This will allow us to decouple ourselves from some of the current dependencies,
such as the folder treemodel, the shell, etc.  This just defines the signals,
the next step is to refactor things and actually make other classes use them.

We need one additional signal yet related to indicating the new unread emails,
but that one will require a little more thought I think.

https://bugzilla.gnome.org/show_bug.cgi?id=604627

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