[qtmozembed] Do not update scroll decorators OnScrolledAreaChanged.

SendAsyncScrollDOMEvent and ScrollUpdate are enough to handle
scroll decorator udpates correctly.
Merge pull request #44 from rainemak/scrollDecoratorUpdate

[qtmozembed] Do not update scroll decorators OnScrolledAreaChanged.
[qtmozembed] Reset dragging and pinching on touch cancel.

In addition, do not allow flicking when touch cancel is received.
[qtmozembed] Reset internal state when touch starts and moving stops.
[qtmozembed] Cancel active touch points when QEvent::TouchCancel received.
Merge pull request #45 from rainemak/AddTouchCancelHandling

Add touch cancel handling
[qtmozembed] Reset touch state properly. Merge remote-tracking branch 'origin/master'