[RFC]: Window focus changes

[Adam Fedor]

I doesn't really change a lot, but it does shift most of the handling 
of Focus to the front-end (which knows more about the state of the 
windows).  I think it fixes a few problems, but there are still Focus 
issues. I wanted to get this out of the way, so I can work more on 
documenting the backend and some other fixes.

focus3-back.patch
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focus3-gui.patch
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let me know if it breaks anything.