We have a couple of places now where we want nice lists made from `list`s, eg
- ‘name’, ‘date’ and ‘phone number’
- ((firstname)) ((lastname)) or ((date))
This commit adds a more generic component for doing this, which can handle:
- 1, 2, and n items
- comma (or other character) separated lists
- a conjunction between the last and one-before-last item
- characters to be inserted before and after each item, eg an opening and
closing HTML tag
It also pulls the `list_of_placeholders` component from the breaking change
page, and makes it use the `formatted_list` component under the hood.
