Support for multiple on richtext fields

[Cook879]

Currently if you set multiple to be true on a richtext field, it just renders multiple longtexts.

This change makes those multiple longtexts into multiple richtexts. It also covers the AJAX scenario in the multiple context (e.g. reorder, add more)

[Cook879]

c1c9b4d

It does look a bit unwieldy, given the default richtext styling is large. I tend to use my own styling but didn't want to commit that to the ingredient