Create table layers as non-selectable in pywwt #89
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This PR updates the glue-wwt table layer to be aware of the changes in WorldWideTelescope/pywwt#334. Recent versions of pywwt have the ability to allow the user to select sources from a catalog via a mouse click, and bring that information into Python. Since we aren't using this in glue-wwt, we don't want the cursor change that accompanies mousing over a point, and so this PR creates the layer with
selectable=False
when the option exists. We should also see a performance improvement when there are a lot of points displayed, since the pywwt JS does some calculations to determine when the cursor is over a selectable point. Note that this PR doesn't prevent us from using selectability in the future in e.g. some selection tool - the layer'sselectable
attribute can be modified after creation.