[Draw2D] Harmonize tool-tip handling of WindowBuilder figures #1118
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By wrapping the tool-tip string in a Label, it is possible to use the setToolTip() method specified by the IFigure interface, thus avoiding an additional setToolTipText() method.
This Label then needs to be unwrapped in our EventManager, as figures are not yet supported here, until the manager has been harmonized with the SWTEventDispatcher.
The tool-tip handling has also been improved so that it is only shown for non-empty strings.