Massive re-factoring of Graphics View's update mechanism.

This is work-in-progress, so don't expect everything to work perfectly.
Most of the auto-test pass and examples and demos seem to run fine.

Unfortunately I'm too tired to write about the actual update mehanism
now, but it's faster than the old approach (if that helps:)). There's
more to optimize, but I'll come back to that later. I need some sleep now :)

To be continued.

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