[RP] updated titlechanged hook patch

[Zed Lopez]

Attached is an updated version of a patch that adds a 'titlechanged'
hook for when the current window's title changes, suitable for keeping
the current window's title in a dzen status bar. The old one didn't
work against the current source (since the newwindow hook was
committed); this one also includes an appropriate doc patch.

titlechanged.patch
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