Issue #2260059 by er.pushpinderrana, joelpittet, LinL, SebCorbin | Mark Carver: Fixed Title in template_preprocess_item_list() is typecasted as string.

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).

Issue #2089331 by grom358 | thedavidmeister: [meta] Replace calls to check_plain() with Drupal\Component\Utility\String::checkPlain().

Issue #2180109 by damiankloip, dawehner, ParisLiakos, joelpittet, MartijnBraam, Xano: Change the current_user service to a proxy.

Issue #1939064 by joelpittet, pwieck, farrington, mark.labrecque, Cottser, InternetDevels, mdrummond, drupalninja99, BarisW, jenlampton: Convert theme_links() to Twig.

Issue #1979468 by Wim Leers, nod_, pwolanin, longwave, thedavidmeister, jessebeach, larowlan | catch: .active from linkGenerator(), l() and theme_links() forces an upper limit of per-page caching for all content containing links.

Issue #1649780 by effulgentsia, jibran, Wim Leers, nod_, hefox, joelpittet, kaare, BarisW, sun, rbayliss, Cottser, fubhy: Remove first/last/odd/even classes in favor of CSS3 pseudo selectors.

Revert "Issue #1979468 by Wim Leers, pwolanin, nod_, thedavidmeister, larowlan: .active from linkGenerator(), l() and theme_links() forces an upper limit of per-page caching for all content containing links."

This reverts commit 624296e7.

Issue #1979468 by Wim Leers, pwolanin, nod_, thedavidmeister, larowlan: .active from linkGenerator(), l() and theme_links() forces an upper limit of per-page caching for all content containing links.

Issue #1614186 by RobLoach, tim.plunkett, msonnabaum, Crell, jhodgdon, Niklas Fiekas: Update coding standards for using 'native' PHP classes like stdClass in namespaced code.

Issue #1828536 by sun, thedavidmeister, benjf, derek.deraps, jenlampton, dcam, pwieck: Rename 'type' variable of theme_item_list() to 'list_type'.

Issue #891112 by Berdir, sun, Amitaibu, siharris, Cottser: Replace theme_item_list()'s 'data' items with render elements.

Issue #1706878 by tim.plunkett: Add WebTestBase::assertThemeOutput() to allow modules to test theme function output.

Issue #1496542 by cosmicdreams, sun, chx, vasi1186, aspilicious, alexpott, nadavoid, Pedro Lozano, disasm, andypost | heyrocker: Convert site information to config system.