MiniProjectTargetSelector: Fix inconsitency in key handling

The keypress event would be forwarded to QWidget::keyPressEvent, but not
the release event.

Change-Id: I98e87b9f8da1133f55b2f4fae246047db1809536
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Display compiler in "About Qt Creator".

In order to determine the build environment for Qt Designer and
other plugins.

Change-Id: I10ca98481097b9425c080a08fabd08e710b6d5c2
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>