Add QtUiTools and uilib

This code used to live in qtbase. It doesn't belong
there however and since there are no dependencies
in qtbase left that require it move it here.

This significantly simplifies the build system with
regards to the code in uilib.

Change-Id: I41c8687bd071a1c253eb55594986f3e1424bc6cf
Reviewed-on: http://codereview.qt-project.org/4830


Reviewed-by: Lars Knoll <lars.knoll@nokia.com>