Issue #2917883 by quietone, TR, Jo Fitzgerald, masipila, phenaproxima: Rename 'migration_templates' directories in core modules to 'migrations'

Issue #2845486 by Jo Fitzgerald, quietone, gaurav.kapoor, ohthehugemanatee, heddn, Yogesh Pawar, catch, shabana.navas, phenaproxima, mikeryan: Rename Migration process plugin and add documentation

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 #2382985 by phenaproxima, quietone, -enzo-, benjy: Migration Files for Drupal 7 Menu & Menu Entries

Issue #2534020 by phenaproxima: Move module-specific migration support into the menu_link_content module

Issue #2463909 by phenaproxima, mikeryan: Migrations should support non-installed default configurations (templates)

Issue #2509496 by chx, benjy, phenaproxima: Make migrate process plugins more flexible/less boilerplate

Issue #2460529 by alexpott, chx, phenaproxima: Migrations need to use the configuration entity dependency system

Issue #2466797 by mikeryan, benjy: Rename migration_groups key to avoid confusion with MigrationGroup support

Issue #2417793 by effulgentsia, Wim Leers, YesCT, yched, dawehner: Allow entity: URIs to be entered in link fields

Issue #2406749 by dawehner, YesCT, amateescu, hussainweb, kim.pepper, RavindraSingh, pwolanin, Wim Leers, Gábor Hojtsy, yched, jibran: Use a link field for custom menu link