#11464 - Fix JS noConflict mode - Refactor all plugins to use an internal reference to the jQuery plugin, because in noConflict mode you can never expect to be defined on the jQuery object

Closes #11958 by rebasing & merging it

Closes #13103 by merging it.

Closes #12850

Makes life for people with custom jQuery builds excluding event aliases much easier.

- Implements new format "Copyright 2011-xxxx Twitter, Inc.", which resonates well with our History page and more accurately reflects the copyright status of the repo
- grunt dist to update all the files

In it's current state Bootstrap always prevents the default action for a click
event on `[data-toggle="modal"]` elements
(see https://github.com/twbs/bootstrap/blob/master/js/modal.js#L233).
Instead this should only happen when the element is a link.

Removes `window.jQuery` in favor of `jQuery`, fixes #10038