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Update to Babel 7 RC2

- Switch to scoped @babel/* packages
- Preset modules must now export a function
- @babel/preset-react now has a development option for jsx-self/jsx-source
- Use new useESModules option for @babel/plugin-transform-runtime for
  smaller webpack builds
- @babel/plugin-transform-runtime's moduleName option was removed - replace
  it with the new absoluteRuntime option
- Use transform-runtime's own default options
  - 'helpers' is also on by default - it's disabled by module build config
    to avoid needing a dependency/peerDependency on @babel/runtime by
    default
- babel.runtime config now takes an Object or false
- babel-preset-proposals replaces stage presets, which have been removed
- Add babel.proposals config
- Deprecate babel.stage config
- Remove support for -test.js files as @babel-core doesn't support pattern
  matching them to ignore them when co-located in src/ - use .test.js
  instead

React

- Switch from babel-plugin-react-transform to react-hot-loader for React
  HMR

Internal Babel-related stuff (test again when Babel 7 is released)

- Drop constructor hack for UserError, as Babel 7's wrapper should handle
  instanceof
- Drop loose mode, as it currently breaks when extending builtins
- Use double quotes in test assertions against generated code
- Use Array.from() instead of spreading a Set to convert it to an Array

Internal

- UserConfigReport errors no longer need to provide a value
- UserConfigReport errors can have multiple messages

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