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IDraggable: Add multi-axis support

See original GitHub issue

Features Suggestion

Feature description:

The mouse interaction for dragable plottables should take the axis index into account. Currently it seems to call

        /// <summary>
        /// Return the X position (in coordinate space) for the given pixel column
        /// </summary>
        /// <param name="xPixel">horizontal pixel location</param>
        /// <returns>horizontal position in coordinate space</returns>
        public double GetCoordinateX(float xPixel) => settings.XAxis.Dims.GetUnit(xPixel);

        /// <summary>
        /// Return the Y position (in coordinate space) for the given pixel row
        /// </summary>
        /// <param name="yPixel">vertical pixel location</param>
        /// <returns>vertical position in coordinate space</returns>
        public double GetCoordinateY(float yPixe) => settings.XAxis.Dims.GetUnit(yPixel);

Which only works if everything happens on the first axis (X and/or Y). If the plottable is on another set of axes, the IsUnderMouse and DragTo methods fail because the coordinates are wrong.

A short term patch could be to consider the second axes too with e.g.

        /// <summary>
        /// Return the X position (in coordinate space) for the given pixel column
        /// </summary>
        /// <param name="xPixel">horizontal pixel location</param>
        /// <returns>horizontal position in coordinate space</returns>
        public double GetCoordinateX(float xPixel,int axisindex = 0) => axisindex == 0 ? settings.XAxis.Dims.GetUnit(xPixel) : settings.XAxis2.Dims.GetUnit(xPixel);

        /// <summary>
        /// Return the Y position (in coordinate space) for the given pixel row
        /// </summary>
        /// <param name="yPixel">vertical pixel location</param>
        /// <returns>vertical position in coordinate space</returns>
        public double GetCoordinateY(float yPixel,int axisindex = 0) => axisindex == 0 ? settings.XAxis.Dims.GetUnit(yPixel) : settings.YAxis2.Dims.GetUnit(yPixel);

If one adds other axes I am not sure how to retrieve the current one…