Use HTML template, not static js, to create new row
Add full-width add-content-row element before multi-column rows
Let user split up rows for dividing into columns
Use add-content and add-content-row markup identically
Add comments to template DOM
Factor editor content-logic out in separate file
Move toolbar logic to toolbar module
Don't assume the first row is the active row
Add TODO
Move drop-area DOM out of add-content
Remove leftover tooltips on control reset
Use popover to display content choices when adding content
Set custom width to add-content popover
Apply data-dnt- attribute convention
Use icons for content items
Rephrase columns warning
Merge branch 'editor'