expose integration apis for 3rd party development

This is a complex feature request, for eh.. inspiration :)

To reduce development effort (and maybe even legal issues) it might be worthwhile to expose integration APIs in djs.

I'm thinking along the lines of Kodi (video/streaming) addons and/or Scoop buckets using github for installation definitions. Streaming, import/export- and library-components might be interesting candidates to expose to 3rd party development. Maybe even opensource. (only the default/built-in integrations would be officially supported obviously)