Issue #1712250 by alexpott, n3or, cam8001, vijaycs85, Albert Volkman, jibran, heyrocker, chx: Convert theme settings to configuration system.

Issue #1944636 by alexpott, YesCT: Fixed PECL Intl extension usage in DateTimePlus class broken and untested.

Issue #1905152 by Gábor Hojtsy, Jose Reyero, vijaycs85, YesCT, penyaskito: Integrate config schema with locale, so shipped configuration is translated.

Issue #1964254 by vijaycs85, YesCT | Gábor Hojtsy: Fixed Configuration schemas missing langcode and uuid at places.

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

Issue #1934700 by nick_schuch: Automated cron runs should only be enabled by default for Standard profile.

Issue #1821420 by vijaycs85, cam8001, Albert Volkman, ACF, typhonius, pcambra, Berdir: Convert mail variables to cmi.

Issue #1829224 by alexpott, pfrenssen, vijaycs85, lirantal: Convert the 'theme_default()' variable to CMI.

Issue #1853086 by katbailey, msonnabaum, alexpott: Remove cache.page.enabled in favor of an explicit internal cache setting.

Issue #1914366 by vijaycs85, Gábor Hojtsy, alexpott: Move all configuration schema files into a schema subdirectory.

Issue #1496480 by mrf, disasm, kbasarab, pfrenssen, cam8001, typhonius, Letharion, ACF, vijaycs85, heyrocker, Berdir, alexpott: Convert file system settings to the new configuration system.

Issue #1866610 by Jose Reyero, Gábor Hojtsy, effulgentsia, alexpott, aspilicious, YesCT, fago, sun, dawehner, heyrocker, yched, spearhead93: Introduce Kwalify-inspired schema format for configuration.

Issue #1833516 by Berdir, chx, catch, webchick: Add $settings for low-level configuration - move things out of .

Issue #1824778 by vijaycs85, ACF, pcambra, cam8001: Covert css_gzip_compression() and js_gzip_compression() variables to CMI system.

Issue #1571632 by cosmicdreams, marcingy, justafish, chx, KarenS, aspilicious, disasm, swentel, dawehner, rvilar: Convert regional settings to configuration system.

This reverts commit 405c5fbd.

Issue #1608842 by chx, alexpott, sun, effulgentsia, beejeebus, tim.plunkett et al: Replace list of bootstrap modules, enabled modules, enabled themes, and default theme with config.