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Update to Babel 7

- Breaking: use transform-runtime's defaults instead of providing our own
  - babel.runtime config now only takes an Object or false
  - Since `helpers` is enabled by default, it's now disabled by module
    build config to avoid needing a dependency/peerDependency on
    @babel/runtime by default
- Breaking: 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
- Switch to scoped @babel/* packages
- @babel/preset-react now has a `development` option which handles using
  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
- babel-preset-proposals replaces stage presets, which have been removed
- Add babel.proposals config
- Deprecate babel.stage config

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 loose mode, as it currently breaks when extending builtins
- Use Array.from() instead of spreading a Set to convert it to an Array

Internal

- Dropped constructor hack for UserError, as Babel 7's wrapper should
  handle instanceof
- Preset modules must now export a function
- UserConfigReport errors no longer need to provide a value
- UserConfigReport errors can have multiple messages
- Use double quotes in test assertions against generated code

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