Aidbox-forms. Define 'itemControlWidgets' for 'signature'

[qscgyjqscgyj]

Ref #264

Please define 'itemControlWidgets' for 'signature'

aidbox-forms questionnaire

{
  "title": "New form",
  "status": "draft",
  "url": "http://forms.aidbox.io/questionnaire/new-form",
  "resourceType": "Questionnaire",
  "item": [
    {
      "type": "attachment",
      "text": "Author's Signature",
      "extension": [
        {
          "url": "http://hl7.org/fhir/StructureDefinition/questionnaire-itemControl",
          "valueCodeableConcept": {
            "coding": [
              {
                "system": "http://aidbox.io/questionnaire-itemControl",
                "code": "signature"
              }
            ]
          }
        }
      ],
      "linkId": "1BOx5VvC"
    }
  ]
}

[ir4y]

Depends on https://github.com/beda-software/fhir-emr/issues/315