removed compatibility for old class names

Author: dg

src/Forms/Control.php

@@ -39,6 +39,3 @@ function getErrors(): array;
 	 */
 	function isOmitted(): bool;
 }
-
-
-interface_exists(IControl::class);

src/Forms/FormRenderer.php

@@ -20,6 +20,3 @@ interface FormRenderer
 	 */
 	function render(Form $form): string;
 }
-
-
-interface_exists(IFormRenderer::class);

src/Forms/SubmitterControl.php

@@ -20,6 +20,3 @@ interface SubmitterControl extends Control
 	 */
 	function getValidationScope(): ?array;
 }
-
-
-interface_exists(ISubmitterControl::class);