Issue #2935256 by Jo Fitzgerald, voleger, kim.pepper, ibustos, Yogesh Pawar, catch, jibran: Remove all usages of drupal_get_message and drupal_set_message in modules

Issue #2901562 by mfernea, Jo Fitzgerald, Yogesh Pawar, 3ssom, Mile23, borisson_: Fix 'Squiz.WhiteSpace.SuperfluousWhitespace' coding standard

Issue #2776975 by joelpittet, dawehner, tim.plunkett, xjm, pfrenssen: March 3, 2017: Convert core to array syntax coding standards for Drupal 8.3.x RC phase

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2630162 by felribeiro, pguillard, pingwin4eg, karsumit94: The Edit URL Alias form buttons should be styled in consistency with other buttons

Issue #2584243 by stefan.r, pwolanin, dawehner, kgoel: Make Drupal handle  path aliases in a consistent and case-insensitive fashion on all database drivers

Issue #2509300 by dawehner, catch, larowlan: Path alias UI allows node/1 and /node/1 as system path then fatals

Issue #1847174 by TravisCarden, Jody Lynn, boromino, Mariano, iaine: Path alias validation should test for relative path, no trailing slash requirements

Issue #2341341 by YesCT, martin107, vijaycs85, fran seva: Change public 'name' property access on languages to getName() and add back setName().

Issue #2345753 by tim.plunkett, dawehner, Wim Leers, damiankloip: Remove url(current_path()) and url(NULL) with <current> and <none>.

Issue #2343661 by larowlan, tim.plunkett | xjm: Rename l() to _l() and url() to _url(), and document replacements.

Issue #2337709 by tim.plunkett: Convert form_state_values_clean() to FormStateInterface::cleanValues().

Issue #2303361 by tim.plunkett, kim.pepper: Replace instances of deprecated drupal_valid_path with PathValidator.

Issue #2308821 by tim.plunkett: Replace FormErrorInterface with $form_state->setErrorByName() and $form_state->setError().

Issue #2246665 by jaredsmith, martin107, YesCT, filijonka, tstoeckler: Typehint with Drupal\Core\Language\LanguageInterface instead Drupal\Core\Language\Language.

Issue #1987802 by disasm, pfrenssen, laurentchardin, tim.plunkett, fgm, vijaycs85, plopesc, Xano, dawehner, h3rj4n: Convert path_admin_overview() to a new style controller.