Implements new XML-based format for examples, demos & tutorials

Done-with: Primrose Mbanefo <ext-primrose.mbanefo@nokia.com>
Change-Id: I42c0afdb419cffe5637cd4f298e828d09e0fb15a
Reviewed-on: http://codereview.qt.nokia.com/840


Reviewed-by: Eike Ziller <eike.ziller@nokia.com>