Update region patch

[Alexandre Julliard]

Here's the first step of moving the update region management to the
server. The refresh on window moves is not optimized yet, so it will
probably flicker quite a bit, but things should still be painted
properly in the end. If you feel like giving this a try, I'm
interested in hearing about any case where things don't repaint
correctly.

-- 
Alexandre Julliard
julliard at winehq.org
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