Issue #1994140 by Berdir, yched, fgm, smiletrl: Unify entity field access and Field API access.

core/lib/Drupal/Core/Entity/EntityAccessController.php

...ib/Drupal/Core/Entity/EntityAccessControllerInterface.php

core/lib/Drupal/Core/Entity/Field/FieldDefinition.php

...lib/Drupal/Core/Entity/Field/FieldDefinitionInterface.php

core/lib/Drupal/Core/Entity/Field/FieldItemList.php

core/lib/Drupal/Core/Entity/Field/FieldItemListInterface.php

...dit/lib/Drupal/edit/Access/EditEntityFieldAccessCheck.php

...lib/Drupal/entity_reference/EntityReferenceController.php

core/modules/field/field.api.php

core/modules/field/field.deprecated.inc

core/modules/field/field.module

core/modules/field/lib/Drupal/field/Entity/Field.php

core/modules/field/lib/Drupal/field/Entity/FieldInstance.php

.../lib/Drupal/field/Plugin/Type/Formatter/FormatterBase.php

.../field/lib/Drupal/field/Plugin/Type/Widget/WidgetBase.php

...dules/field/lib/Drupal/field/Plugin/views/field/Field.php

.../modules/field/lib/Drupal/field/Tests/FieldAccessTest.php

core/modules/field/lib/Drupal/field/Tests/FormTest.php

...dules/field/tests/modules/field_test/field_test.field.inc

core/modules/file/file.api.php