Issue #2664780 by Wim Leers, tedbow, dawehner, klausi: Remove REST's resource- and verb-specific permissions for EntityResource, but provide BC and document why it's necessary for other resources

Revert "Issue #2664780 by Wim Leers, tedbow, dawehner, klausi: Remove REST's resource- and verb-specific permissions for EntityResource, but provide BC and document why it's necessary for other resources"

This reverts commit 85d755a9.

Issue #2664780 by Wim Leers, tedbow, dawehner, klausi: Remove REST's resource- and verb-specific permissions for EntityResource, but provide BC and document why it's necessary for other resources

Issue #2752325 by Wim Leers, marthinal, dawehner, ericpugh: Automatically provide HEAD support when a REST resource supports GET

Issue #2308745 by Alumei, dawehner, Wim Leers, larowlan, Arla, alexpott, g.oechsler, R.Muilwijk, Berdir, catch, klausi, clemens.tolboom, MattA, Crell: Remove rest.settings.yml, use rest_resource config entities

Issue #2724823 by tedbow, dawehner, Wim Leers, clemens.tolboom: EntityResource: read-only (GET) support for configuration entities

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

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

Issue #2481453 by dawehner, pwolanin, rteijeiro, neclimdul, znerol: Implement query parameter based content negotiation as alternative to extensions

Issue #2472323 by dawehner, neclimdul, Crell, kim.pepper, nod_, Wim Leers, larowlan, jibran, pwolanin, catch: Move modal / dialog to query parameters

Issue #2339491 by corbacho, dawehner, larowlan, effulgentsia, webflo: Ajax requests on forms with files fail on IE 9

Issue #2350837 by dawehner, Berdir, larowlan, Wim Leers: Convert most usages of EntityInterface::getSystemPath() to use routes

Issue #2318753 by greenhodge, amitgoyal, Devin Carlson: REST Module: Fix documentation that refers to enabling/disabling of modules

Issue #2063303 by dawehner, damiankloip, Wim Leers: Fixed A Drupal 8 AjaxResponse that must return a 403, returns a 403 and prints 'A fatal error occurred: '

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).

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

Issue #2208609 by sun, Jalandhar, damiankloip: Move Json utility class into Drupal\Component\Serialization.

Issue #2093173 by longwave, Cyberschorsch, forbesgraham, sandipmkhairnar, damiankloip, rbayliss, grom358, harijari, InternetDevels, dawehner: Remove all calls to drupal_json_decode(), use \Drupal\Component\Utility\Json::decode().

Issue #2080373 by mrsinguyen: Remove Unused local variable $response from /core/modules/rest/lib/Drupal/rest/Tests/ReadTest.php.

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

Issue #2076033 by juampy: Fixed PHP warning when looking if a REST resource defines authentication providers.

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

Issue #1891052 by klausi: Fixed Protect write operations from CRSF by requiring an token (when using cookie/session-based authentication).