MainWindow: Delay restoreWindowState even more

When opening a core dump using command-line, the window still appears as
"fake maximized"

Change-Id: Ifdd9b58df1506de73357b9c3722bf6f3eaa3a1de
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
QmakeProject: Remove unneeded namespace qualification

Change-Id: I82b00db276149a146a53dd3a22da3d9a5aad498f
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
QmakePM: De-duplicate QmakePriFileNode::deleteFiles()

Change-Id: I0fc1442314e61d2f8a8b712a8e28b8c03ef4fddf
Reviewed-by: Daniel Teske <daniel.teske@digia.com>