Core: Hide the theme editor

It isn't ready for production yet, will hopefully be reworked for 3.4.

Change-Id: If738f40df5cd2b4ab7edbcdc0086c7aa5d5f47f6
Reviewed-by: Alessandro Portale <alessandro.portale@digia.com>
QmlDesigner.PropertyEditor: Fixing templates

toolTip was renamed to tooltip.

Change-Id: I18fc3cfb3f9ce21a6402ce3adccbb078a297b682
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>