Squish: Configure old Qt Quick projects with Qt 4

Change-Id: I3a891ba8a3ca5d437c114a95fb1620a200261301
Reviewed-by: Christian Stenger <christian.stenger@digia.com>
Welcome: Store examples search text in settings

in QtCreator.ini under "WelcomePage/ExamplesSearchString".
The installer pre-set that setting, and in that way pre-
select a set of examples.

Change-Id: I8ac5a38ad0bd3f33875ef1997ccbf0352410dcc3
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>