Issue #2347465 by tim.plunkett, dawehner, cilefen: Convert all instances of #type link/links to convert to use routes.

Issue #2304987 by Berdir, Wim Leers: Fixed Don't invalidate cache tags of referenced entities, use entity list cache tags correctly, add test coverage for entity list cache tags.

Issue #2277103 by tim.plunkett, pwolanin, Wim Leers, dawehner, hotpizzas: Switch Drupal::l() and LinkGenerator to expect a Url object.

Issue #2343651 by xjm, tim.plunkett, Wim Leers, dinarcon, dawehner: Remove most remaining l() calls.

Issue #2250325 by jhodgdon, azinck, splatio: Fixed Route book.render (path /book) does not seem to work.

Issue #2171071 by jessebeach, dawehner, chakrapani, longwave, Gábor Hojtsy, xjm, Wim Leers: Rename drupal_add_library() to _drupal_add_library() and remove its uses.

Issue #2084421 by dawehner, pwolanin, YesCT, clemens.tolboom, Berdir, Xano, Sutharsan: Phase 2 - Decouple book module schema from menu links.

Issue #2085957 by tankerjoe: Document that BookController methods return render arrays, not strings.

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 #2057589 by smiletrl, tim.plunkett, alexpott, dawehner: Rename ControllerInterface to ContainerInjectionInterface.

Issue #1998140 by dawehner, ParisLiakos, tim.plunkett: Remove backward compatible ControllerInterface.

Issue #1938296 by disasm, YesCT: Convert book_admin_overview() and book_render() to a new-style Controller.