Update namespaces declaration in include/

- Remove unused use statements
- Add required use statements

src/Core/Renderer.php

@@ -8,7 +8,6 @@ namespace Friendica\Core;
 use Exception;
 use Friendica\BaseObject;
 use Friendica\Render\FriendicaSmarty;
-use Friendica\Render\ITemplateEngine;
 
 /**
  * @brief This class handles Renderer related functions.