Now it is possible to set a stylesheet file to customize
the wizard's UI. The stylesheet adds to the config.xml
file using the new "StyleSheet" element.
Change-Id: I66271f755a0f742e96cf433fe557423a2261e432
Reviewed-by: Iikka Eklund <iikka.eklund@theqtcompany.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@theqtcompany.com>