(cherry picked from commit 7c89385360b8842a5a7444b8641634ed1d9716a7)

Issue #2816857 by Adita, hussainweb, Hardik2309, hardik.p, heddn: Process plugin link_uri shouldn't be in d6 namespace

(cherry picked from commit 957997df)

(cherry picked from commit 8d783b7c)

Issue #2807905 by svendecabooter: Convert Menu_link_content's Migrate source tests to new base class

(cherry picked from commit e672f610)

Issue #2572801 by alexpott, vprocessor, andriyun, andypost, chishah92, Mile23, attiks, hussainweb, klausi, dawehner, pfrenssen: Fix 'Drupal.WhiteSpace.ScopeIndent' coding standard

Issue #2781673 by Bambell, Berdir: MenuLinkContent menu links can not be set to no parent once they had one

(cherry picked from commit b2e94794)

(cherry picked from commit ad76a96a)

Issue #2648996 by tstoeckler, quietone, chx, therealssj, webflo, benjy: Optimize menu link migration

Revert "Issue #2560795 by mikeryan, phenaproxima, penyaskito, willwh, benjy: Source plugins have a hidden dependency on migrate_drupal"

This reverts commit 89815ba3.

Issue #2560795 by mikeryan, phenaproxima, penyaskito, willwh, benjy: Source plugins have a hidden dependency on migrate_drupal

Issue #2700581 by mikeryan, benjy, heddn, vasi: Destination bundle set in destination plugin, not in process

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

Issue #2719695 by alexpott, Mile23: Fix 'Drupal.Classes.ClassDeclaration.CloseBraceAfterBody' coding standard

Issue #2716685 by Mile23: Part 2: Fix several errors in the 'Drupal.Commenting.DocComment' coding standard

Issue #2456477 by Berdir, dawehner, heddn, pguillard: Convert deprecated \Drupal\simpletest\KernelTestBase tests to KernelTestBaseNG

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

Issue #2686765 by sidharthap, thhafner: cacheUntilEntityChanges() is deprecated and should be replaced with addCacheableDependency()

Issue #2625696 by chx, benjy, alexpott, catch, mikeryan, andypost, phenaproxima: Make migrations themselves plugins instead of config entities

Issue #2679953 by malavya, subharanjan, AjitS, aditya_anurag, mikebell_, jhodgdon: Replace mentions of url() in docs

Revert "Issue #2625696 by chx, alexpott, benjy, mikeryan, andypost, phenaproxima: Make migrations themselves plugins instead of config entities"

This reverts commit 694994fe.

Issue #2625696 by chx, alexpott, benjy, mikeryan, andypost, phenaproxima: Make migrations themselves plugins instead of config entities

Issue #2579691 by lauriii, alexpott, stefan.r, YesCT, dawehner: Remove usages of SafeMarkup::isSafe()

Issue #2664466 by dawehner, alexpott, kostyashupenko: url_alias table is only used by a core service but it depends on system install

Issue #2641696 by naveenvalecha, heykarthikwithu, Mac_Weber: Replace deprecated usage of  entity_create('menu_link_content') with a direct call to  MenuLinkContent::create()

Issue #2572643 by alexpott, attiks, Jelle_S, jhodgdon: Fix Drupal.Commenting.FileComment coding standard

Issue #2181151 by dawehner, tim.plunkett, InternetDevels, botanic_spark: Remove router rebuild from menu_ui.install

Issue #2641592 by Mac_Weber: Replace deprecated usage of  entity_create('menu') with a direct call to Menu::create()

Issue #2590993 by mikeryan, webflo, svendecabooter, dixon_, phenaproxima: Create stub entities with proper default values

Issue #2072945 by Berdir, plach, effulgentsia, Schnitzel, andypost, Wim Leers: Remove the $langcode parameter in EntityAccessControllerInterface::access() and friends

Issue #2463567 by borisson_, Wim Leers, Xano: Push CSRF tokens for forms to placeholders + #lazy_builder