Issue #3138746 by jungle, rajandro, sja112, longwave, jameszhang023, quietone, dww: Fix 45 "shouldBeCamelCased" and related typos in core

Issue #2722609 by anoopjohn, mfernea, Jo Fitzgerald, chishah92, druprad, martin107, Mile23: Fix Drupal.Commenting.FunctionComment.ParamNameNoMatch

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2368797 by Wim Leers, dawehner, rteijeiro: Optimize ajaxPageState to keep Drupal 8 sites fast on high-latency networks, prevent CSS/JS aggregation from taking down sites and use HTTP GET for AJAX requests

Issue #2389697 by Wim Leers, Gábor Hojtsy: Editor settings altering not needed (and not compatible with config schema assumptions)

Issue #1996238 by sun, nod_, damiankloip, Wim Leers, longwave, alexpott, Xano, mdrummond, Mark Carver, Jeff Burnz, highrockmedia, joelpittet, et al: Replace hook_library_info() by *.libraries.yml file.

Issue #2099741 by Wim Leers, wwalc, mr.baileys, eaton, dstol, nod_, effulgentsia: Protect WYSIWYG Editors from XSS Without Destroying User Data.

Issue #2168113 by penyaskito, jessebeach, catch: Add leading underscore and other discouragement to drupal_add_css() and drupal_add_js().

Issue #1833716 by quicksketch, Wim Leers, sun, TwoD: Added WYSIWYG: Introduce 'Text editors' as part of filter format configuration.

Revert "Issue #1833716 by quicksketch, Wim Leers, effulgentsia: added WYSIWYG: Introduce 'Text editors' as part of filter format configuration."

Fixing commit credit.

This reverts commit ee1b6de6.

Issue #1833716 by quicksketch, Wim Leers, effulgentsia: added WYSIWYG: Introduce 'Text editors' as part of filter format configuration.