Add legend for Experimental spectrum #161
Draft
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Turns out creating a legend is easy, but manipulating (deleting / recreating) is much harder. Looks like we need to manipulate the Legend object directly.
https://docs.bokeh.org/en/latest/docs/user_guide/basic/annotations.html#manual-legends
https://discourse.bokeh.org/t/clearing-plot-or-removing-all-glyphs/6792
https://discourse.bokeh.org/t/clearing-plot-or-removing-all-glyphs/6792/9