Use delta-based multiple value storage instead of comma-separated single items

jensschuppe → changed the visibility of the branch submissionDisplayValues to hidden.

jensschuppe → changed the visibility of the branch multipleValues to hidden.

I added some more adjustments which seems to cover all places that display values of the CMRF Reference field, including forms (also multi-value fields on multi-step webforms), editing forms of submissions, display of submissions in both, table and single entity view.

There might be a configuration option needed for whether to actually query every field value when displaying a lot of them, as this causes API requests for each value.

@jaapjansma, @kainuk looking forward to your comments.

Automatically closed - issue fixed for 2 weeks with no activity.