Issue #2238077 by Berdir, alexpott, tim.plunkett: Rename EntityFormController to EntityForm.

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

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

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

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

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

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

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

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

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

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

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

core/lib/Drupal/Core/Form/FormBuilderInterface.php

core/modules/action/action.module

core/modules/action/lib/Drupal/action/ActionAddForm.php

core/modules/action/lib/Drupal/action/ActionEditForm.php

...les/action/lib/Drupal/action/ActionEditFormController.php

core/modules/action/lib/Drupal/action/ActionFormBase.php

.../modules/aggregator/lib/Drupal/aggregator/Entity/Feed.php

core/modules/aggregator/lib/Drupal/aggregator/FeedForm.php

.../custom_block/lib/Drupal/custom_block/CustomBlockForm.php