Issue #3377900 by omkar.podey, lauriii, Gauravvvv, Utkarsh_33: Scrolling remains disabled after closing nested modal dialogs

Issue #2707291 by Utkarsh_33, lauriii, darvanen, samuel.mortenson, hooroomoo, komalk, narendraR, Vidushi Mehta, sasanikolic, droplet, smustgrave, yoroy, Bcwald, kostyashupenko, penyaskito: Disable body-level scrolling when a dialog is open as a modal

Issue #2894269 by droplet, Akram Khan, _pratik_, dylf, nod_, Cottser: `bool` in JSDoc should be `boolean`

Issue #3278415 by nod_, lauriii, catch, Wim Leers, longwave, xjm, claudiu.cristea: Remove usages of the JavaScript ES6 build step, the build step itself, and associated dev dependencies

Issue #3253148 by mherchel, longwave, ckrina, droplet: Remove IE from core's browserlist, remove non-essential CSS importing and recompile assets

Issue #3101543 by lauriii, bnjmnm, ravi.shankar, alexpott: Update core JavaScript dependencies listed in package.json

Revert "Issue #3101543 by lauriii, bnjmnm, ravi.shankar: Update core JavaScript dependencies listed in package.json"

This reverts commit 2dadb738.

Issue #3101543 by lauriii, bnjmnm, ravi.shankar: Update core JavaScript dependencies listed in package.json

Issue #2559241 by droplet, tic2000: Closing an #ajax dialog triggers Javascript errors when scrolling

Issue #2548195 by nod_, JohnAlbin, madhavvyas, sriharsha.uppuluri: Only use single quotes in JavaScript and update .eslintrc

Issue #2113911 by LewisNyman, Manuel Garcia, longwave, nod_, Rajendar Reddy, pakmanlh, olemedia, rteijeiro: Modal style update.

Broke Bartik, still needs discussion.

This reverts commit 5a8a34e8.

Issue #1913510 by erich_s, jibran, scresante, nod_, mitron: Core Javascript Files Not Using Standard Indentation.

Issue #1851414 by nod_, quicksketch, frega, dawehner, damiankloip: Convert Views to use the abstracted dialog modal.

Issue #2107199 by Wim Leers: Allow Close(Modal)DialogCommand to remove the dialog from the DOM, document how client-side dialogs can do that too.

Issue #1879120 by quicksketch, Wim Leers, larowlan, frega: Use Drupal-specific image and link plugins — use core dialogs rather than CKEditor dialogs, containing alterable Drupal forms.

Issue #1870764 by quicksketch, dawehner, frega, larowlan, nod_: Add an ajax command which makes it easy to use the dialog API in complex cases.

Issue #1667742 by larowlan, nod_, effulgentsia, jessebeach, sun: Change notice: Add abstracted dialog to core (resolves accessibility bug).