core: add qPref.h_and qPrefprivate.h

add 2 header files and 1 cpp file (qPrefPrivate does not have an implementation)

The rewrite/consoliadation of SettingsObjectWrapper, qmlmanager, qmlpref and planner
needs a place to put common private parts (qPrefPrivate) and 1 common class (qPref).

Signed-off-by: Jan Iversen <jani@apache.org>

core/settings/qPref.cpp

@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "qPref_private.h"
+#include "qPref.h"
+
+
+qPref *qPref::m_instance = NULL;
+qPref *qPref::instance()
+{
+	if (!m_instance)
+		m_instance = new qPref;
+	return m_instance;
+}
+
+
+
+void qPref::loadSync(bool doSync)
+{
+}