Issue #1804380 by miro_dietiker, vijaycs85, 8thom, swentel: Convert color variables to config/state.
Issue #1829224 by alexpott, pfrenssen, vijaycs85, lirantal: Convert the 'theme_default()' variable to CMI.
Issue #1793074 by cweagans, sun, chx: Convert .info files to YAML.
Issue #1937270 by ACF: Change drupal_css_cache_files() into state.
Issue #1799594 by nod_, Wim Leers, jessebeach, jcisio: Update to jQuery 1.9 version.
Issue #1292284 by ParisLiakos, RobLoach, karschsp: Require 'type' key in .info.yml files.
Issue #1947720 by damiankloip: Use Drupal::state() to replace state().
Issue #1987066 by Kevin Morse, JohnAlbin, rteijeiro, echoz, ry5n: Rename files to match CSS file naming convention.
Issue #1898052 by jenlampton, taslett, Cottser, Pierre Paul Lefebvre, c4rl, joelpittet: Convert color module to Twig.
Issue #2003814 by dasjo, pmelab, Cottser: Remove Bartik process layer functions, refactor color module alterations.
Issue #2013094 by pwieck, Cottser: Remove unnecessary template_preprocess() reference from all Twig files
Issue #1992606 by damiankloip, pwieck: Convert system_theme_settings() to FormInterface.
Issue #2015789 by fubhy, echoz, rteijeiro, LewisNyman, penyaskito: Remove language_css_alter() (RTL stylesheets) in favor of HTML 'dir' attribute.
Issue #2030925 by echoz: Quote rtl attribute selector.
Issue #352951 by Wim Leers, mfer, mcjim, larowlan, RobLoach, sdboyer, Owen Barton, JohnAlbin: Make JS & CSS Preprocessing Pluggable.
Issue #2010636 by mcjim, Wim Leers, typhonius: Remove drupal_add_css() and drupal_add_js() from color.module — use #attached.
Issue #1963942 by joelpittet, ACF, dasjo: Change all instances of $vars to $variables.