Not to pollute the global namespace with rather generic names
(especially in case QT_NAMESPACE is none); also drop the
(now)redundant 'Q' prefix in the names.
Change-Id: I57ea7e3996cced705f7ddbdbc1e0231191b31c43
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>