Biggest changes:
- There is now a "Single values" widget, previously a behavior triggered on required single-bundle, single-value fields.
- The "Multiple values" widget now respects entity access (add, edit, delete permissions).
- If "Allow users to add existing $entity" is enabled, the "Remove" button in the widget unlinks the entity by default (removing the reference), with the "delete" optionally triggered by a checkbox on the confirmation form.
- Fixed multiple issues with line items.