Try to move widget/gvitem code into new QtMultimediaKitWidgets lib.

Change-Id: I522b3e6d4465c6c5cce2483676e09320176837d6
Reviewed-on: http://codereview.qt.nokia.com/2665


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Jonas Rabbe <jonas.rabbe@nokia.com>