See if we can use vegaEmbed actions

[rikedyp]

Refers to the default menu provided by vegaEmbed (save as... view source etc.)

in #.VegaLite.Html.InnerBody

b,←'vegaEmbed(''#vis'',vlSpec, {"actions": false});'

It might be nice to have this if we can make the callbacks work. Else we will have to implement a menu ourselves. One caveat, for example, is that HTMLRenderer doesn't do a File Browser (File Save, File Open) window, so that might be a problem.

[JoshDavid]

Let's see if the functions can return an SVG array as a result (by default or resultstype specified by ⍺)

[rikedyp]

Looks like the SVG/PNG links are data URLs and it doesn't look like HTMLRenderer sends callback requests to APL for those - I also know that there is no SaveAs-style file browser in HTMLRenderer, so we'd have to implement our own. Perhaps there are settings that modify what these buttons should do, but we might be better off implementing our own features anyway.