tst_touchmouse: Have a go at some stabilisation & improvements

* Use QScopedPointer to own views, preventing leakage (was a problem in
  a few of these tests, e.g. pinchOnFlickable/flickableOnPinch/mouseOnFlickableOnPinch)
* Only qWaitForWindowActive, as the tests aren't doing anything
  graphical, they don't need an expose event, which means less waiting
* Use the test utilities to center the windows on screen to make sure
  they are not under desktop chrome & have a non-null position.
  If position is 0,0 that means window->position().isNull() is true,
  so qWaitForWindowActive will wait for its entire timeout: 5 seconds.
  This means no "manual" tweaking of geometry anymore: the position is now taken
  care of by the test utilities, and we let the root QML item size determine the
  window size.
* Move the mouse away from the window using the test utilities.

Done-with: Shawn Rutledge
Change-Id: I4ac6a0d56067c57ef51f186fe3cd118cab056ff2
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>

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