mochajs / mocha / 7877

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build UMD bundle and polyfill language features (#4366)

- use rollup's `umd` bundle instead of `iife`
    - consume Rollup config's `output` prop in `karma-rollup-plugin`
    - simplify `rollup.config.js` `output` prop
    - fix invalid `script` tag `src` attrib in `lib/browser/template.html` (& reformat)
    - use core-js polyfills
- remove old ESlint rule to disallow `Object.assign` (it's now allowed... but so is object rest/spread, which works in many  cases)
- fix travis script
- karma-related:
    - update Symbol test for IE11, as the polyfill is just a polyfill.
    - add a proper RequireJS integration test
    - remove the old `bundle/amd.spec.js` test
    - try to make `karma.conf.js` less intimidating
    - allow custom externals/globals in karma rollup plugin
    - `unexpected`, `unexpected-eventemitter`, and `unexpected-sinon` are now external (not bundled) and loaded via their globals
    - modified `test/browser-specific/setup.js` to use `require()` since we can do that now
    - bundle now has an inline source map since I couldn't figure out any other way to load it
    - removed duplication of work in the karma plugin; no call to `bundle.generate()` is needed. furthermore the `code` prop did not include the inline source maps. so we just write the file and read the result. could probably avoid reading the file by manually stitching the `code` and `map` props together, but I'm unsure how
    - loads `mocha.js.map` for debugging

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