toward a more efficient event loop

Hi all,
if you compare Cuis morphic feel to Squeak morphic feel, the former looks
snappy, the latter sluggish.
Especially if your trackpad generates a bunch of MouseWheelEvent
(MouseScrollEvent in Cuis) whenever you're willing to scroll.
Why is that?

Squeak World goes through an interCyclePause:  at every mouse event.
Indeed, when the hand *processEvents* it stops at first mouse event
encountered.

Hence, unless you are ready to sacrifice some battery life with a
Preferences higherPerformance,
the event buffer might take several seconds to drain with such strategy,
especially on mac.
It makes the user experience somehow catastrophic.

Cuis has a different strategy:
- processEvents drains the event buffer.
  however, it only processes one mouse move event per cycle, and drops the
other ones.
- the world cycle doesn't pause if (lastCycleHadAnyEvent or: [
deferredUIMessages isEmpty not ])
- it also does not pause further than the next morphic step or alarm
- the pause grows gradually from 20 to 200ms whenever there is no activity
  but at least %)ms in server mode

 Maybe it's time to revise our strategy too !

Nicolas

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