8 string references to 'Plugin' in Zircon Profile 8.0

admin_toolbar_tools.routing.yml in modules/admin_toolbar/admin_toolbar_tools/admin_toolbar_tools.routing.yml

modules/admin_toolbar/admin_toolbar_tools/admin_toolbar_tools.routing.yml

block.schema.yml in core/modules/block/config/schema/block.schema.yml

core/modules/block/config/schema/block.schema.yml

ContextualLinkManagerTest::testPluginDefinitionAlter in core/tests/Drupal/Tests/Core/Menu/ContextualLinkManagerTest.php

Tests the plugins alter hook.

migrate.data_types.schema.yml in core/modules/migrate/config/schema/migrate.data_types.schema.yml

core/modules/migrate/config/schema/migrate.data_types.schema.yml

migrate_drupal.source.schema.yml in core/modules/migrate_drupal/config/schema/migrate_drupal.source.schema.yml

core/modules/migrate_drupal/config/schema/migrate_drupal.source.schema.yml

search.schema.yml in core/modules/search/config/schema/search.schema.yml

core/modules/search/config/schema/search.schema.yml

system.schema.yml in core/modules/system/config/schema/system.schema.yml

core/modules/system/config/schema/system.schema.yml

tour.schema.yml in core/modules/tour/config/schema/tour.schema.yml

core/modules/tour/config/schema/tour.schema.yml