JsonWizard: Introduce a JsonWizard pointer into SummaryPage

This stopps us from qobject_casting all over the place.

Change-Id: I703ebb48aea7d00546e48ffb7a7fda21dc28d2cf
Reviewed-by: Daniel Teske <daniel.teske@theqtcompany.com>
Debugger: Make most of tooltip label a handle for dragging.

Previously, the actual text, not the free space, was usable.

Change-Id: Ib33990def16e48826505c45b6b764dc4c9fbb314
Reviewed-by: Christian Stenger <christian.stenger@digia.com>