update media_flat to JSON

[dustymc]

Source

#276

Summary

media_flat now has components, which are much more portable. Replace all uses of

• license
• terms

with

• license_url
• license_text
• terms_url
• terms_text

User Interface Changes

nope

Data Structure Changes

nada

[dustymc]

I'm refactoring this.

• postgres is great with JSON
• CF is great with JSON
• we have a media API, efficiency is important

so..

• media-flat should be rewritten in JSON
• everything that uses media_flat should be converted to use JSON
• the API should be rebuilt to pull from media_flat

[dustymc]

Add: Identifiers should be real/in compliance with our dev principles (see eg https://arctos-test.tacc.utexas.edu/media/10905192 which currently uses partial/local identifiers)