* Admin UI: implement HTML embeds
* Admin UI External Actions: set correct useHTML on edits
* Admin UI: edit by index, not URL
* External Actions: render HTML on stream frontend
* Don't open embeds externally
* Remove TODO comment
* Add HTML as unique action key
* Admin UI: Actions: use CodeMirror editor, dropdown
* WIP External actions modal frontend
* Add external action links
* Allow modal to show/hide and use a dynamic url
* Use external link object instead of just url for state
* add style and placement to external action buttons
* reformat and simplify tag list style as not to conflict with action buttons and make them look less actionable since they're not
* fix bug to open modal
* have Esc key close modal
* fix style on modal
* make modal bg darker
* close modal when you click outside of it
* fix zindex
* Add support for external action icons and colors
* Some external action modal sizing + loading spinner
Co-authored-by: Ginger Wong <omqmail@gmail.com>