QTest::QTouchEventSequence: add a sleep before each touch movement

In any code (such as QtQuick Flickable) which calculates velocity as
distance / time, it's unrealistic to simulate instantaneous touchpoint
movements.  So, force a slight delay before each event, so that
the touchpoint can only move very fast, but not infinitely fast.
We use qSleep() rather than qWait() because qWait() has a minimum
qSleep(10), and also processes events.  commit() also conditionally
calls processEvents(), and we don't want to make that unconditional.

Change-Id: I3cee890f8951d7ecb8837a6abe216c5a8e0a6e34
Reviewed-by: Liang Qi <liang.qi@qt.io>

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