Allow Space Management Roles to Add Iframe Embed to Enable for Content Types

As an alternative to current Embeds, allow Space Manager Roles to use IFRame to embed content. Include this with other feature request for allowing embed on first post of a Space Thread as well as Course Module Lesson content. This opens the door to man,many more content types and use cases.

I'm also asking if it's possible from the lumi.education developer to host here and embed on another site to play SCORM and H5P.