Issue #1849752 by effulgentsia, Berdir, jibran, neclimdul: Abstract non-Drupal-specific parts of AnnotatedClassDiscovery into a Drupal\Component base class.
Issue #1793074 by cweagans, sun, chx: Convert .info files to YAML.
Issue #1930974 by jenlampton: Update description text on Placeholder.
Issue #1932382 by Berdir, swentel: Use DrupalUnitTestBase for Field API tests.
Issue #1292284 by ParisLiakos, RobLoach, karschsp: Require 'type' key in .info.yml files.
Issue #1875992 by amateescu, swentel, yched: Add EntityFormDisplay objects for entity forms.
Issue #1620010 by dawehner, ParisLiakos, plach, jibran: Move LANGUAGE constants to the Language class.
Issue #2004224 by Berdir, andypost: Convert tests using TestEntity to EntityTest (except Field API tests).
Issue #1985344 by tim.plunkett, swentel: Add a dedicated @FieldFormatter annotation.
Issue #1950632 by effulgentsia, Wim Leers, amateescu, yched: Create a FieldDefinitionInterface, decoupled from  and  config entities, and use it for formatters and widgets.
Issue #1981306 by aspilicious, andypost, pcambra, swentel, amateescu: Drop procedural usage of fields in [a-e] modules.
Issue #1983548 by Berdir, LukyLuke_ch, giammi, effulgentsia: Convert contact message entities to the new Entity Field API.
Issue #1969728 by yched, effulgentsia, swentel, fago, plach: Implement Field API 'field types' as TypedData Plugins.
Issue #2014821 by amateescu, swentel: Introduce form modes UI and their configuration entity.
Issue #1867856 by fubhy the cat, EclipseGc, Berdir: Use annotation discovery for data type plugins.
Issue #2035315 by dawehner: Add a dedicated @FieldWidget annotation.
Issue #2021817 by effulgentsia, yched: Make widgets / formatters work on EntityNG Field value objects.
Issue #2041423 by yched: Rely on 'provider' instead of 'module' for Field plugin types.
Issue #2015703 by plopesc, mordonez, yched: Convert field type to typed data plugin for email module .