Document that you need to declare DEPENDENCIES in order to use other modules' C++ types in your module

[build] Warning: main.qml:58:13: Type QPointF of parameter aPanDirectionVector in signal called sigPanInDirection was not found, but is required to compile onSigPanInDirection. Did you add all import paths? [signal-handler-parameters]
[build]             onSigPanInDirection: aPanDirectionVector => root.scatterPlotModel.transformModel.gui_panInDirection(aPanDirectionVector)
[build]             ^^^^^^^^^^^^^^^^^^^
[build] Warning: main.qml:59:13: Type QRectF of parameter aSelectionArea in signal called sigSelectArea was not found, but is required to compile onSigSelectArea. Did you add all import paths? [signal-handler-parameters]
[build]             onSigSelectArea: (aSelectionArea, aSelectionMode) => root.scatterPlotModel.gui_selectArea(aSelectionArea, aSelectionMode)
[build]             ^^^^^^^^^^^^^^^

class PlottingMouseInteractionsUIComponent : public QObject {
    Q_OBJECT
    QML_ELEMENT

    // ...

signals:
    void sigZoomAtMousePosition(const QPointF& aMousePos, double aZoomScaleFactor);
    void sigPanInDirection(const QPointF& aPanDirectionVector);
    void sigSelectAtPosition(const QPointF& aMousePos, const PlottingSelectionMode aSelectionMode);
    void sigSelectArea(const QRectF& aSelectionArea, const PlottingSelectionMode aSelectionMode);
};