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Rename seven to eight.
Issue #2006952 by thedavidmeister: Replace theme() with drupal_render() in seven.theme.
Issue #1987066 by Kevin Morse, JohnAlbin, rteijeiro, echoz, ry5n: Rename files to match CSS file naming convention.
Issue #556380 by deekayen, ParisLiakos, cweagans: Remove OpenID from core.
Issue #1932948 by falcon03: Primary tabs could not work in certain situations due to a wrong ARIA role.
Issue #2003908 by tim.plunkett: regression of primary button styling.
Issue #1938848 by Jaesin, Cottser, jenlampton, hefox, Shawn DeArmond, frob, boze, joelpittet, mrf, dcrocks: seven.theme - Convert PHPTemplate templates to Twig.
Issue #1961870 by Cottser, foopang, kgoel, shanethehat, tlattimore, c4rl, joelpittet, thedavidmeister: Convert page.tpl.php to Twig.
Issue #1989488 by echoz, LewisNyman: Vertical tabs style update.
Issue #1292284 by ParisLiakos, RobLoach, karschsp: Require 'type' key in .info.yml files.
Issue #1712250 by alexpott, n3or, cam8001, vijaycs85, Albert Volkman, jibran, heyrocker, chx: Convert theme settings to configuration system.
Issue #1978036 by echoz: Clean up css in vertical tabs.
Issue #1913618 by tim.plunkett, amateescu: Convert EntityFormControllerInterface to extend FormInterface.
Issue #1973456 by echoz: Fixed .element-invisible on element at right causes horizontal scrollbar on desktop or right gap on phone on webkit browsers.
Issue #1719640 by nod_, droplet, Wim Leers, SebCorbin: Use 'button' element instead of empty links.
Issue #1937824 follow-up by echoz, mariacha1: Simpler fix for Improve button-link spacing on confirm form.
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 #1940208 by pameeela, mgifford, echoz: Fixed Contrast for add & remove shortcut links on overlay not sufficient for WCAG - Regression.
Issue #1937824 by mariacha1, keyhitman, pixelmord, pameeela: Fixed Improve button-link spacing on confirm form.
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 #1913692 by mgifford: Convert Seven to HTML5.
Issue #1849754 by kanchuraji, droplet: fixed add and remove shortcuts hover text alignment.
Issue #1793074 by cweagans, sun, chx: Convert .info files to YAML.
Issue #1871772 by larowlan, EclipseGc: Convert custom blocks to content entities.
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