Refs #19908

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Refs http://eslint.org/docs/user-guide/migrating-to-2.0.0#new-rules-in-eslintrecommended

Refs http://eslint.org/docs/user-guide/migrating-to-2.0.0

Refs #19908

Refs #19908

Enable new rules:
* no-empty-pattern
* no-magic-numbers (exempting 0 and ±1)

Refs #19908

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Mostly KeyboardEvent.which and MouseEvent.which values.

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* Use $.one() instead of $.on() since there are no $.off()s in the code.
* Remove unnecessary namespacing of listeners for the `scroll` & `load` events.
    These are vanilla DOM events (not custom jQuery namespaced events)
    and we're not using jQuery namespacing to manage these event listeners either (e.g. `$.off()`).

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Fixes #19878

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This allows for keyboard navigation (e.g. arrow keys left/right to
trigger different radio buttons) following an initial mouse click
interaction

js/tests/index.html: Replace jQuery event alias methods with functions that throw explanatory errors, instead of with undefined

Refs https://github.com/twbs/bootstrap/pull/19219#issuecomment-184653699

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Fixes #19028

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Modal: Ignore spurious `focus` event that Firefox fires at `document` when switching back to its tab

Fixes #18365
Refs https://bugzilla.mozilla.org/show_bug.cgi?id=1228802

See also https://bugzilla.mozilla.org/show_bug.cgi?id=1228802

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Errata from:
* 8ce5da30
* 5d3144e8
which missed a few numbers.

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