QmlDesigner.ItemLibrary: Adding TabView

Change-Id: I7335f9ce23673ee1215390eb7bb3396fec8e5ebc
Reviewed-by: Thomas Hartmann <Thomas.Hartmann@digia.com>
Qbs: Move updating of files from a project to own method

Change-Id: I88b41ff450dac4e0c2e5a34e3332e559c1919e6e
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>
Qbs: Avoid crash when build changes the project tree

Change-Id: I52fe5bb49f762e8837c5ea825adb20650316ff7b
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>