Sort table columns by whether they're shown or hidden

It'd be nice if the UI automatically sorted the columns drag-n-drop editor based on visibility. It's a bit of a pain sorting the active columns around the disabled ones + it can look very disorganized.

Or possibly a toggle to sort the columns if needed.

Hey @everettmorgan :wave: Thanks for writing out this feature request! In the meantime, we do have a workaround if you're interested: http://community.retool.com/t/how-to-save-column-order/6621/3