Add support for cloning value types

import QtQuick 2.1
import QtQuick.Controls 1.0
Item
{
	property var listOfQVectors: []

	Component
	{
		id: component
		QtObject
		{
			property vector3d v: Qt.vector3d(0,0,0)
		}
	}
	Column
	{
		Button
		{
			text: "create, delete"
			onClicked:
			{
				var object = component.createObject(parent, {"objectName": "hello"})
				listOfQVectors.push(object.v);
				// workaround : listOfQVectors.push(Qt.vector3d(object.v.x, object.v.y, object.v.x));
				listOfQVectorsChanged()
				print("before destroy: " +listOfQVectors[0])
				object.destroy();
			}
		}
		Button
		{
			text: "print"
			onClicked: print("after destroy: " +listOfQVectors[0])
		}
	}
	
}

before destroy: QVector3D(0, 0, 0)
after destroy: undefined