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multiple async done() calls result in failure; closes #4151

- added a method in `errors` module to create a "multiple done" err
- modernize `multiple-done.spec.js`
- refactor errors into constants in `errors` module
- remove `Runner#started` prop; replace with `Runner#state` prop + constants
- add a catchall `createFatalError()` function to `errors` module; this is called
  when a test fails twice by other means (unsure what those means are yet)

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