Files now import directly from prop-types/checkPropTypes

* Moved test-utils into react-dom package
* Added test-utils to package.json 'files' list
* Added ReactTestUtilsFBEntry module (though it doesn't really do anything at the moment)
* Replaced ReactDOM references with react-dom to avoid duplicating code

…ific entry point. Throw explicit error if imported in prod mode

…erer

> Doesn't handle context. Doesn't handle updates. Doesn't properly handle top-level createElement comparisons.

…iendly shallow renderer

Replaced shallow renderer based on test renderer with a custom, isolated implementation that's stack and fiber compatible

Handling an edge case discovered while running the new shallow renderer against www. Also added a new test case for this

…uldComponent* hooks

* No longer call the 'componentDidMount' lifecycle hook
* Get 'ReactDebugCurrentFrame' from 'ReactGlobalSharedState'
* Use more standard 'shouldConstruct' type check for class vs functional components
* Don't pass 'prevContext' param to 'componentDidUpdate'

Also update instance context and state if 'shouldComponentUpdate' returns false.

Don't require subclass constructors to pass this along to super

… test vars to const/let