Move API Response methods into an own class to make them mockable

src/Module/Api/Twitter/Account/RateLimitStatus.php

@@ -21,6 +21,7 @@
 
 namespace Friendica\Module\Api\Twitter\Account;
 
+use Friendica\Module\Api\ApiResponse;
 use Friendica\Module\BaseApi;
 use Friendica\Util\DateTimeFormat;
 
@@ -51,6 +52,6 @@ class RateLimitStatus extends BaseApi
 			];
 		}
 
-		self::exit('hash', ['hash' => $hash], $parameters['extension'] ?? null);
+		ApiResponse::exit('hash', ['hash' => $hash], $parameters['extension'] ?? null);
 	}
 }