Selectize fields with drag&drop functionality

[amacea-dms]

Selectize-rails gem seems to be abandoned. It uses a very old version of selectize.js that does not have all the latest features like drag&drop plugin for example. Could you please remove the abandoned selectize-rails gem and use the latest version of selectize.js instead?

[nickcharlton]

I think we've got a good path to actually do this now #2397 is merged.

I note that we're using selectize though and not @selectize/selectize so maybe it won't be a trivial upgrade, but I'm not sure.

Is this something you'd like to do?