ENH: Improvements to the 2D histogram, including legend.
Added a vtkColorLegend class, this is now displayed in a 2D histogram chart, and uses a vtkAxis to display the scale. There is still some work to do to get everything laid out correctly. Disabled the test for now, until the layout and display is working as expected. Change-Id: Iaa2a47538158d340d2f2c7120bd61d61e179b6cf
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