Devdraw now waits for the image: this means that

there is no more blank image when toggling
fullscreen, when unminimizing, or at startup; this
also means that we can live resize, but we only
enable live resizing with Page, because it seems
useless for other apps, and Acme and Sam bug with
it. The tradeoff is that bottom corners are
sometimes automatically rounded. There is a way to
prevent the rounding here:
http://parmanoir.com/Custom_NSThemeFrame
but this would obfuscate the code. Instead, we
make sure that the corners are always rounded.

Closing the window while its content is updated
causes an exception, without this patch. This
seems to happen regularly with stats(1).

This patch avoids a possible deadlock at startup,
which I never experienced. If I recollect right,
there is little chance that this happens on a
multi-core CPU.

Minimizing now activates next app in line, and
Devdraw now stops drawing while minimized.

R=rsc
CC=plan9port.codebot
http://codereview.appspot.com/5499043

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