Remove virtual child integers.

Remove virtual child integers.

This makes the accessibility apis much
simpler and less error prone.

Disable the itemviews implementation that is in complex widgets.
The itemviews will use the new code from itemviews.h/cpp everywhere now.

QToolBox was broken before, now at least it simply exposes all its children.
The children are the buttons (tabs of the toolbox) and their contents.

Change-Id: I45e218f49f02aebbd678ddfe29f94c2a112a2125
Reviewed-by: Jan-Arve Sæther <jan-arve.saether@nokia.com>