AjaxFormAction: Doesn't work outside of CMS, refactor or deprecate for sapphire

[ischommer]

we're conveying the perception that this field 1. submits forms via ajax and 2. updates the form content correctly. ajax-submit only works within the cms, updating/evaluating is handled outside of the FormField? class in cms-specific javascript.

If we keep it unchanged, i'd recommend deprecating it for sapphire, and moving it into cms.

Its up for discussion if this serverside javascript amalgamation is a good idea in the first place - this should be seen in the broader scope of redeveloping our javascript infrastructure (where FormResponse? will probably play a less significant role).