feature: swagger-ui-react module (via #5207)

* swagger-ui-react alpha.0

* alpha.1

* alpha.2

* alpha.3

* begin updating README

* alpha.4

* WIP: `displayOperationId` support

* move loading error readouts to BaseLayout

* add `url` prop

* export React component as default

* add interceptor support

* modify docs markup

* add `onComplete` prop

* add `spec` prop

* Update README.md

* alpha.6

* remove independent manifest; build releasable exclusively from template

* ensure dist is present; drop config field in manifest

* drop alpha field

this script is now able to release to npm!

* remove unused selector references

* Update README.md

README.md

@@ -7,10 +7,11 @@
 **🕰️ Looking for the older version of Swagger UI?** Refer to the [*2.x* branch](https://github.com/swagger-api/swagger-ui/tree/2.x).
 
 
-This repository publishes to two different NPM modules:
+This repository publishes to three different NPM modules:
 
 * [swagger-ui](https://www.npmjs.com/package/swagger-ui) is a traditional npm module intended for use in single-page applications that are capable of resolving dependencies (via Webpack, Browserify, etc).
 * [swagger-ui-dist](https://www.npmjs.com/package/swagger-ui-dist) is a dependency-free module that includes everything you need to serve Swagger UI in a server-side project, or a single-page application that can't resolve npm module dependencies.
+* [swagger-ui-react](https://www.npmjs.com/package/swagger-ui-react) is Swagger UI packaged as a React component for use in React applciations.
 
 We strongly suggest that you use `swagger-ui` instead of `swagger-ui-dist` if you're building a single-page application, since `swagger-ui-dist` is significantly larger.
 
@@ -67,7 +68,6 @@ To help with the migration, here are the currently known issues with 3.X. This l
 - Support for `collectionFormat` is partial.
 - l10n (translations) is not implemented.
 - Relative path support for external files is not implemented.
-- There are compatibility [issues](https://github.com/swagger-api/swagger-ui/labels/epic%3A%20usage%20in%20react%4016) with React 16.x.
 
 ## Security contact