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

Issue #2225399 by marcvangend, yanniboi, mr.baileys, Wim Leers, visabhishek: Apply formatters and widgets to Feed base fields.

Issue #2152673 by ParisLiakos: Remove duplicate edit route from aggregator and make delete/add consistent with rest of core.

Issue #1878302 by martin107, InternetDevels, nick_daffodil, chrisroane: Use 'delete' over 'remove' in the aggregator module.

Issue #2080699 by mrsinguyen: Remove Unused local variable $items from /core/modules/aggregator/lib/Drupal/aggregator/Tests/AggregatorTestBase.php.

Issue #1988612 by effulgentsia, yched, Wim Leers, Berdir, Pancho: Apply formatters and widgets to rendered entity base fields, starting with node.title.

Issue #2074037 by Wim Leers, effulgentsia: Add drupalPostUrl() — drupalPost()/drupalPostAjax() are for forms only, D8 JS performs non-form HTTP requests.

Issue #2067007 by andypost: Replace \Drupal:: with ->container->get() in test classes of aggregator module.

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

Issue #1498674 by plach, das-peter, Schnitzel, dawehner, YesCT, attiks, Berdir, Gábor Hojtsy, Soul88, Carsten Müller: Refactor node properties to multilingual.

Issue #1620010 by dawehner, ParisLiakos, plach, jibran: Move LANGUAGE constants to the Language class.

Issue #1784784 by beltofte: Standardize capitalization on actions, in aggregator: 'update items', 'remove items'.

Issue #293318 by alex_b, Berdir, rootatwc, Aron Novak, mustafau, akahn: Convert Aggregator feeds into entities.

Issue #1535868 by EclipseGc, tim.plunkett, xjm, Jody Lynn, sdboyer, naxoc, tizzo, effulgentsia, dawehner, disasm, beejeebus: Convert all blocks into plugins.

Issue #1711070 by kid_icarus, tim.plunkett, xjm, droplet, zendoodles and cam8001: Convert tests to use ::$modules property instead of parent::setUp($modules).

- Patch #1496462 by acrollet, sun, cosmicdreams, Niklas Fiekas, aspilicious: convert RSS publishing settings to configuration system.