[FE] Angular JS implementation

The component properties window does a call to the backend,
e.g. [CMS]/_rp/[component-uuid]./hippo-default/en, to get the property values.

The output is JSON, for a link picker field type it is for example:

{
    "properties": [
        {
            "name": "document",
            "value": "banners/banner2",
            "displayValue": "banner2",
            "type": "linkpicker",
            "label": "Document",
            "hint": null,
            "defaultValue": "",
            "description": "",
            "required": true,
        }
    ]
}

Another property is to be added to above: "offlineDocument" : true

The right side properties editor should respond to the attribute.

to have the offline icon near to the field we will add the icon to the primitive-filed component.

we will create a new component as offline field indicator to avoid repeating the code in different places.