[RP] patch to add hook on window title changing

[Zed Lopez]

Hi folks,

Here's a tiny patch that adds a "titlechanged" hook to be triggered
when the current window's title changes. I did this so I configure
titlechanged and switchwin hooks that would maintain the current
window's title in dzen.

It might be more useful to also call it whenever switchwin is
triggered, so I wouldn't have to configure them separately for that
case, but I thought I'd submit it as is for your comments.

title_changed.patch
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