Qt copyrights are now in The Qt Company, so we could update the source code headers accordingly. In the same go we should also fix the links to point to qt.io.
Change-Id: I7f14f408e04c5c4f73a913fae153adcffbebe38f Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com> Reviewed-by: Jani Heikkinen <jani.heikkinen@theqtcompany.com>