Change Zend namespace to Laminas (#1963)

Also ensure backwards compatibility for extensions that use the Zend framework but don't explicitly require it.

src/Foundation/ErrorHandling/ViewFormatter.php

@@ -11,10 +11,10 @@ namespace Flarum\Foundation\ErrorHandling;
 
 use Flarum\Settings\SettingsRepositoryInterface;
 use Illuminate\Contracts\View\Factory as ViewFactory;
+use Laminas\Diactoros\Response\HtmlResponse;
 use Psr\Http\Message\ResponseInterface as Response;
 use Psr\Http\Message\ServerRequestInterface as Request;
 use Symfony\Component\Translation\TranslatorInterface;
-use Zend\Diactoros\Response\HtmlResponse;
 
 /**
  * A formatter for turning caught exceptions into "pretty" HTML error pages.

src/Foundation/InstalledApp.php

@@ -17,11 +17,11 @@ use Flarum\Foundation\Console\InfoCommand;
 use Flarum\Http\Middleware\DispatchRoute;
 use Flarum\Settings\SettingsRepositoryInterface;
 use Illuminate\Contracts\Container\Container;
+use Laminas\Stratigility\Middleware\OriginalMessages;
+use Laminas\Stratigility\MiddlewarePipe;
 use Middlewares\BasePath;
 use Middlewares\BasePathRouter;
 use Middlewares\RequestHandler;
-use Zend\Stratigility\Middleware\OriginalMessages;
-use Zend\Stratigility\MiddlewarePipe;
 
 class InstalledApp implements AppInterface
 {

src/Foundation/MaintenanceModeHandler.php

@@ -10,12 +10,12 @@
 namespace Flarum\Foundation;
 
 use Illuminate\Support\Str;
+use Laminas\Diactoros\Response\HtmlResponse;
+use Laminas\Diactoros\Response\JsonResponse;
 use Psr\Http\Message\ResponseInterface;
 use Psr\Http\Message\ServerRequestInterface;
 use Psr\Http\Server\RequestHandlerInterface;
 use Tobscure\JsonApi\Document;
-use Zend\Diactoros\Response\HtmlResponse;
-use Zend\Diactoros\Response\JsonResponse;
 
 class MaintenanceModeHandler implements RequestHandlerInterface
 {