Remove foreign type macros

class Q_GRAPHS_EXPORT QAbstract3DSeries : public QObject {
    Q_OBJECT
    ...
    QML_NAMED_ELEMENT(Abstract3DSeries)
    QML_UNCREATABLE
    ...
};    

class Q_GRAPHS_EXPORT Q3DScatterSeries : public QAbstract3DSeries {
    ...
    Q_OBJECT
    QML_UNCREATABLE
    QML_NAMED_ELEMENT(Scatter3DSeries);
    ...
};

class QQuickGraphsScatter3DSeries : public QScatter3DSeries {
    Q_OBJECT
    QML_NAMED_ELEMENT(Scatter3DSeries)
    ...
};