CSS source maps require the style-loader to use URL.createObjectURL (rather than just a <style> tag). For some reason, this crashes Electron's webview process, which completely breaks the embedded extension inside of Nuclide and other Electron apps. This commit turns (CSS) source maps off for production builds to avoid this crash.
* Add version 4 react-devtools and react-devtools-core packages which support both React Native and e.g. Safari or iframe DOM usage.
* Replaces typed operations arrays with regular arrays in order to support Hermes. This is unfortunate, since in theory a typed array buffer could be more efficiently transferred between frontend and backend for the web extension, but this never actually worked properly in v8, only Spidermonkey, and it fails entirely in Hermes so for the time being- it's been removed.
* Adds support for React Native (paper renderer)
* Adds a style editor for react-native and react-native-web
