Reduced lagging begind of windows on slower displays

In certain situations a speedy mouse might generate more move-events
than fluxbox can handle: The event queue will fill up faster than the
repositioning of the window is finished. The user will experience a
window which lags behind the mouse cursor, aka the window-dance.

We now check the next event in the queue and postpone the move a little
bit so the queue does not fill up that fast.

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