qcommandlineparser.cpp: fix compilation (QHash not defined)

Change-Id: I46f8882b96ceb4e24fba69637615ddd2a1143adc
Reviewed-by: Laszlo Papp <lpapp@kde.org>
Use <QtCore/foo.h> in public includes.

Change-Id: I180952e0c2e0f99de8ac81720468edb33c3f83af
Reviewed-by: Laszlo Papp <lpapp@kde.org>