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support hot reloading for React components (with code splitting)

Administrator requested to merge hot-reloading into master

Created by: sqs

Low priority

This improves the development experience: it makes it so you can save a React component in your editor and see the change applied within seconds on your dev server.

Production builds are unaffected.

Use the env var NO_HOT=1 to disable hot reloads if needed.

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