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

Issue #1305882 by dawehner, nod_, Fabianx, Steven Jones, sun, nlisgo: drupal_html_id() considered harmful; remove ajax_html_ids to use GET (not POST) AJAX requests

Issue #2383865 by mgifford, pguillard, rpayanm, alexpott, jhodgdon: Spellchecking Drupal - Javascript

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

Issue #2089631 by Wim Leers | jessebeach: Fixed Showing/hiding of CKEditor plugin settings is fragile, automate it (breaks in narrow viewports and when enabling CKEditor).

Revert "Issue #2089631 by Wim Leers | jessebeach: Fixed Showing/hiding of CKEditor plugin settings is fragile, automate it (breaks in narrow viewports and when enabling CKEditor)."

This reverts commit 46db1365.

Issue #2089631 by Wim Leers | jessebeach: Fixed Showing/hiding of CKEditor plugin settings is fragile, automate it (breaks in narrow viewports and when enabling CKEditor).

Issue #2100329 by cosmicdreams: Use \Drupal instead of Drupal to make IDEs and static code analyse tools happy.

Issue #1894644 by Wim Leers, quicksketch: Unidirectional editor configuration -> filter settings syncing.

Issue #1890502 by Wim Leers, quicksketch, jessebeach, nod_, sun, effulgentsia: Added CKEditor module to core.