Display SSP Authz Boundary

[rgauss]

Closes #225

Recreation of #253

If looking to do manual testing of this you can run the app in REST mode with pointing to a service with changes in EasyDynamics/oscal-rest-service#49

[rgauss]

Rename OSCALDIagram.test.js to OSCALDiagram.test.js

I did that locally but somehow it was not included in the commit so had to do it via GitHub UI.

[kylelaker]

Rename OSCALDIagram.test.js to OSCALDiagram.test.js

I did that locally but somehow it was not included in the commit so had to do it via GitHub UI.

Oh yeah, fixes like this get weird on case-insensitive filesystems like APFS if you do mv fIlE file && git add . && git commit -- instead, git usually does better with it if you git mv fIlE file && git commit.

[kylelaker]

I still need to test this but I do have an early question based on a just-reading-the-code review.

[kylelaker]

Good stuff!

[hreineck]

Awesome! Image displays and looks nice locally, and all tests pass.