RGBA opaque regions

I would like to re-propose a new hint for the ewmh spec, with the changes
that were suggested by Fredrik Höglund.

_NET_WM_OPAQUE_REGION

As I would like to change gtk+ to be able to support RGBA colormaps by
default, we would like some mechanism to allow the compositing manager to be
optimized by knowing the regions of the window that are opaque.  Matthias
Clasen would like to only enable RGBA-by-default in gtk+ if this proposed
hint is available in _NET_SUPPORTED.  The toolkit would store the region as
a list of rectangles which represent regions that are known to be opaque.

If nobody disagrees, I will try to prepare a patch against the spec and file
that.

Thanks,
   Cody

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