Exporting STIX Bundles and Collection Bundles should convert LinkById tags into Markdown References

[ElJocko]

Convert LinkById tags to markdown references for:

• object.description
• technique-object.x_mitre_detection
• object.external_references[n].description

(LinkById: T0001)

becomes

[Object Name](url-for-object)

where Object Name and url-fo-object are pulled from the object referenced by the LinkById.

{
  stix: {
    name: 'Object Name',
    external_references: [
      {
        source_name: 'domain',
        external_id: 'T0001',
        url: 'url-for-object'
      }
    ]
}