Issue #2296237 by er.pushpinderrana: Replace check_plain() to Drupal\Component\Utility\String::checkPlain() in file module.

Issue #2216535 by jhodgdon, Berdir: Replace Node overview topic and Node API topic with Entity Hooks topic.

Issue #2283717 by amitgoyal, joshi.rohit100, g3r4 | jackbravo: Remove user_access function calls on hook_permission functions.

Issue #1898070 by benjifisher, jjcarrion, LinL, idflood, joelpittet, oshelach, tlattimore, Les Lim, sergey.semashko, jesse.d, bdgreen, jenlampton, Cottser, duellj, artofeclipse, vlad.dancer, steveoliver, EVIIILJ, c4rl, elv, OpenChimp: File.module - Convert theme_ functions to Twig.

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

Issue #2211227 by mondrake, xjm | fietserwin: Refactor image and imagetoolkit: isExisting, isSupported, supportedTypes, getMimeType.

Issue #2190313 by pfrenssen, Berdir, amateescu, ianthomas_uk: Add $EntityType::load() and loadMultiple() to simplify loading entities.

Issue #2183113 by jhodgdon, effulgentsia, tim.plunkett, herom, larowlan: Update hook_help signature to use route_name instead of path.

Issue #2241655 by tim.plunkett: EntityStorageInterface::create() should always create a "new" entity.

Issue #1399846 by slashrsm, Gábor Hojtsy, Berdir, brantwynn, visabhishek, David_Rothstein, cweagans, martin107, SteffenR, Dave Reid: Make unused file 'cleanup' configurable.

Issue #2225739 by killua99, Berdir, andypost, pfrenssen: Remove usage of field_info_instances(), use EntityManager::getFieldDefinitions() instead.

Issue #2103621 by mondrake | fietserwin: Move GD logic from ImageInterface to toolkit, tie toolkit instance to Image instance, toolkits should no longer be instantiated separately.

Issue #2203407 by nod_, sun: Replace #attached library array values with provider-namespaced strings.

Issue #2045927 by herom, martin107, ianthomas_uk, Xano, michaellander, Sutharsan: Replace all drupal_alter() deprecated function calls.

Issue #1996238 by sun, nod_, damiankloip, Wim Leers, longwave, alexpott, Xano, mdrummond, Mark Carver, Jeff Burnz, highrockmedia, joelpittet, et al: Replace hook_library_info() by *.libraries.yml file.

Issue #2187735 by ianthomas_uk, Sutharsan, andypost: Add removal information to docblock of all @deprecated functions.

Issue #2045921 by juanolalla, Xano, Sutharsan, InternetDevels, ianthomas_uk: Replace all module_invoke() deprecated function calls.

Revert "Issue #2045921 by juanolalla, Xano, Sutharsan, InternetDevels: Replace all module_invoke() deprecated function calls."

This reverts commit 98cdbfec.

Issue #2045921 by juanolalla, Xano, Sutharsan, InternetDevels: Replace all module_invoke() deprecated function calls.

Issue #2165155 by Berdir, tim.plunkett: Change $entity_type to $entity_type_id and $entity_info to $entity_type/$entity_types.

Issue #2078387 by Xano, andypost, twistor, splatio, InternetDevels, amateescu, Berdir, larowlan, vladan.me: Add an EntityOwnerInterface.

Issue #2074475 by benjy, Gábor Hojtsy: Rename {file_managed}.timestamp to 'changed' and add a created timestamp.

Issue #1815504 by pwolanin, Kevin Hankens: File_save_upload() should not alter the file URI string before validation.

Issue #2005716 by tim.plunkett, msonnabaum, dawehner, alexpott, effulgentsia: Promote EntityType to a domain object.

Issue #1954892 by dawehner, David_Rothstein, tim.plunkett: Replace 'theme callback' and hook_custom_theme() with a clean theme negotiation system.

Issue #1998638 by damiankloip, dawehner, kim.pepper, cosmicdreams, alexpott, larowlan, Damien Tournoud: Replace almost all remaining superglobals (, , etc.) with Symfony Request object.