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 #2707255 by timmillwood, dawehner, amateescu, Berdir: All content entities should inherit baseFieldDefinitions

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

Issue #2533964 by edurenye, Berdir, Gábor Hojtsy: Langcode widget visibility settings from language.module are not applied consistently

Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files

Issue #2230637 by plach, fran seva, yched, swentel: Create a Language field widget and the related formatter

Issue #2100343 by Berdir, fago, martin107, visabhishek, sriharsha.uppuluri, Yorirou: Remove 'fieldable' key in entity definitions in favour of 'field_ui_base_route'.

Issue #2313757 by Berdir, Wim Leers, dawehner: Remove text_processing option from text fields, expose existing string field types as plain text in UI.

Issue #1976158 by Berdir | msonnabaum: Rename entity storage/list/form/render "controllers" to handlers.

Issue #2289063 by larowlan, andypost | Berdir: Change contact message entity to behave more like a normal entity.

Issue #2084323 by Berdir, sandipmkhairnar, Xano, Jalandhar: EntityForm::actions() adds 'delete' without checking access.

Issue #2114707 by Berdir, yched, amateescu, effulgentsia, fago: Allow per-bundle overrides of field definitions.

Issue #2119905 by damiankloip, tim.plunkett, Berdir: Provide @ConfigEntityType and @ContentEntityType to have better defaults.

Issue #1823494 by Berdir, sun, Jānis Bebrītis: Field API assumes serial/integer entity IDs, but the entity system does not.

Issue #2004244 by Berdir, plach, tim.plunkett, msonnabaum, das-peter: Move entity revision, content translation, validation and field methods to ContentEntityInterface.

Issue #1847002 by tim.plunkett, effulgentsia, msonnabaum: Move entity type classes from Drupal$provider\Plugin\Core\Entity to Drupal$provider\Entity.

Issue #1983548 by Berdir, LukyLuke_ch, giammi, effulgentsia: Convert contact message entities to the new Entity Field API.

Issue #1856556 by Berdir, andypost, das-peter: Convert user contact form into a contact category/bundle.

Issue #1391694 by tim.plunkett, aspilicious, fago, pounard, plach, Crell, msonnabaum, tstoeckler: Use type-hinting for entity-parameters.