Issue #1898454 by c4rl, gnuget, Hydra, mr.baileys, Sean Charles, joelpittet: system.module - Convert PHPTemplate templates to Twig.

Issue #1946454 by andypost, kim.pepper, tim.plunkett, ParisLiakos: Convert all confirm_form() in system.module and system.admin.inc to the new form interface and convert route.

Issue #1925660 by ACF, tim.plunkett, mtift, heddn, Cottser: Convert system's system_config_form() to SystemConfigFormBase.

Issue #1974580 by nod_, Wim Leers: Introduce domReady to remove jQuery dependency from drupal.js and clean it up.

Issue #1927608 by EclipseGc, tim.plunkett, effulgentsia: Remove the tight coupling between Block Plugins and Block Entities.

Issue #1827448 by RobLoach, sun, jbrown, tstoeckler: Use __DIR__ instead of DRUPAL_ROOT where possible/sensible.

Issue #1987298 by tim.plunkett, quicksketch: Shorten directory structure and PSR-0 namespacing for plugins.

Issue #1913618 by tim.plunkett, amateescu: Convert EntityFormControllerInterface to extend FormInterface.

Issue #1959306 by jessebeach: Drupal.announce does not handle multiple messages at the same time; Improve the utility so that simultaneously calls are read.

Issue #625958 by slashrsm, quicksketch, eojthebrave, droplet, danlinn, czigor: Support Uploading Multiple Files for HTML5 Browsers via #multiple attribute.

Issue #1955926 by quicksketch: Fixed CKEditor admin interface not touch-compatible (Add jQuery Touch Punch to core).

Issue #1913086 by jessebeach, Wim Leers, mgifford, nod_: Generalize the overlay tabbing management into a utility library.

Issue #1033116 by eojthebrave, c4rl, brianV, tim.plunkett | webchick: Rename template.php to THEMENAME.theme to elimnate ambiguity around 'the template file' vs. 'template files'.

Issue #1912594 by krishworks, Berdir: Convert drupal_http_request() usage in system.module to Guzzle.

Issue #1924368 by JohnAlbin, ykhadilkar, carwin: Change notice: Rename old CSS constants to CSS_AGGREGATE_* and add new CSS weight constants.

Issue #1847084 by jessebeach, trawekp, LewisNyman, nod_, tarekdj: Fixed Vertical toolbar doesn't work with overlay (measure/track displacing elements better + provide change events for them).

Issue #1175830 by larowlan, casey, mgifford,, scott.gonzalez, Everett Zufelt, effulgentsia: Update to jQuery UI 1.10 so that Drupal dialogs can be tested for accessibility.

Issue #1664844 by alexpott, cweagans, heyrocker, eojthebrave, ACF, Berdir: Convert image toolkits into plugins.

Issue #1764474 by Berdir, chx, alexpott, pounard, msonnabaum: Make Cache interface and backends use the DIC.

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 #1875086 by Crell, plach, effulgentsia, sun, msonnabaum, Rob Loach, quicksketch, David_Rothstein: Change notice: Improve DX of drupal_container()->get().