Add modal formatter

Problem/Motivation

If needed we could (as alternative to lazy loading) add our own Drupal modal formatter using Drupal.modal() API.

But we won't implement this, until needed. Maybe the library will solve this? https://github.com/scaleflex/js-cloudimage-360-view/issues/167

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes