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fix improper warnings for invalid reporters (#4275)

* fix improper warnings for invalid reporters

    also: reorganize, add, and refactor a bunch of problematic unit tests for `lib/mocha.js`.  better isolation except where we can't really do that (calling `require`)

    there's still missing tests in here, but this is an improvement.

* restrict use of Object.assign in ESLint config
* add wrapper around process.cwd()
    - better isolation
    - a use of `process.cwd()` in `lib/runner.js` was left in place to avoid conflicts, because another PR will remove it

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