Move images to media and add license/caption, if known

[nichtich]

Images of items (linked with https://www.wikidata.org/wiki/Property:P18) are returned in depiction but these image URLs cannot be used for license issues. Better put a small version (thumbnail) into media instead and possibly add license information.

Example from https://www.wikidata.org/wiki/Q1237 having P18 https://commons.wikimedia.org/wiki/File:Zaytal_Suldenferner_K%C3%B6nigspitze.jpg having Commons URI https://commons.wikimedia.org/entity/M60656862

{
  "type": "Manifest",
  "id": "https://commons.wikimedia.org/entity/M60656862"
  "items": [],
  "thumbnail": [
    {
      "type": "Image",
      "id": "https://upload.wikimedia.org/wikipedia/commons/thumb/4/4b/Zaytal_Suldenferner_K%C3%B6nigspitze.jpg/440px-Zaytal_Suldenferner_K%C3%B6nigspitze.jpg",
      "format": "image/jpeg"
    }
  ],
  "rights": "http://creativecommons.org/licenses/by-sa/4.0/",
  "requiredStatement": {
    "label": { "en": [ "Attribution" ] },
    "value": { "en": [ "Wghler" ] }
  },
  "provider": [ {
      "id": "https://commons.wikimedia.org/",
      "type": "Agent",
      "label": { "en": [ "Wikimedia Commons" ] }
    } ]
}

This likely requires an additional query to commons structured data so may slow down queries.