Plugin subdomain for custom fields

Changes in: app Permalink

Plugins have received their custom subdomain for Storyblok so they no longer can access the context from within the field type. This was necessary to not allow field types to access localstorage and other information that are not intended to be shared with the plugins.

Please update your configurations to allow rather than since all API calls will be done by that domain starting with 30.04.2019.