class-based UI customization

[KiaraGrouwstra]

allowing response object 'class' based custom template overwrites:

• how to detect an "object"'s "class" using an api spec that has had all their $refs resolved?
  • in case the resolved spec still retains the original centralized $ref definitions (modify so it does this?), then I could just do an object equality check for definitions with the spec at the current path.
• probably involves doing such a check in ng-output/value
• have each custom template know what definition path they want specs equality checked with
• load with DynamicComponentLoader so existing components are ok without needing the custom component hard-coded in their directives
• alternatively also just allow overriding templates of generic components
  • perhaps even split the generic components into their own library to encourage others to add versions of alternative CSS libraries
    • allow passing options so as to specify preferred CSS lib from the scraper as well