Issue #1951268 by larowlan, nick_schuch, jibran, dawehner, alexpott, tim.plunkett: Convert /forum and /forum/% to new routing system, remove forum_forum_load(), forum_get_topics(), create new Forum service.
Issue #2038135 by RobLoach, donquixote, Crell, ParisLiakos, catch: Use the Composer autoloader to make everything simpler.
Issue #2079551 by pwolanin: Fixed @file doxygen for test classes under Drupal\system\Tests\Plugin.
Issue #2078847 by andypost: Clean-up the rest of 'plugin.manager.entity' to 'entity.manager'.
Issue #2051917 by dawehner: Fixed Test contextual links feature of page displays.
Issue #2078285 by pwolanin, dawehner: Add short-cut methods to the \Drupal class for generating URLs and links from routes.
git commit -m Issue
Revert "git commit -m Issue"

This reverts commit a234a4fa3bfdaf64a0a3b97651aa1a1a4610d763.

Bad commit message. :P
Issue #2079025 by yched, Berdir: Remove dead code (e.g. field_test().storage.inc) due to entity storage refactoring.
Issue #2078967 by pwolanin: Fix formatting to 80 columns for @throws in UrlGeneratorInterface::generateFromRoute().
Issue #2075199 by RobLoach: Update jQuery Once to 1.2.3.
Issue #2062213 by duozersk: Fixed Remove Unused local variable  from /core/lib/Drupal/Core/StreamWrapper/LocalStream.php.
Issue #2078885 by Letharion: Fixed The file/progress hook menu item is not necessary.
Issue #2068199 by balagan: Fixed Douple space in string.
Issue #2078991 by pwolanin: Fix @file doxygen for classes under Drupal\Component\Plugin.
Issue #1938314 by kgoel, mparker17, Kars-T, disasm, tim.plunkett, daffodil_naveen, ygerasimov, jibran, dawehner, wamilton, Letharion | Crell: Convert book_export() to a new-style Controller.
Issue #2078139 by andypost: Clean-up CommentTestBase.
Issue #2047935 by stevector, m1r1k: Remove references to global user variable in tracker module.
Issue #2079477 by ParisLiakos: Fixed ForumManager and ForumController use ->translationManager->translate() instead of ->t().
Issue #2040199 by kim.pepper, afeijo, larowlan, ParisLiakos: Convert aggregator_page_category_form() and aggregator_page_source_form() to a Controller.