QtIFW

Sort the child components.

The higher the value, the higher up in the list the component
is ordered. Currently we handled it the opposite, thus we had
to assign every component a value to get sorting work.

Change-Id: I6003cb95b69ba4160eb822565edf120dd0f0543f
Reviewed-by: Niels Weber <niels.weber@digia.com>
Reviewed-by: Iikka Eklund <iikka.eklund@digia.com>
Reviewed-by: Tim Jenssen <tim.jenssen@digia.com>