Queue support (#1773)

Implementation of clean queue handling, by default sync is used

src/Queue/ExceptionHandler.php

@@ -0,0 +1,64 @@
+<?php
+
+/*
+ * This file is part of Flarum.
+ *
+ * (c) Toby Zerner <toby.zerner@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Flarum\Queue;
+
+use Exception;
+use Illuminate\Contracts\Debug\ExceptionHandler as ExceptionHandling;
+use Psr\Log\LoggerInterface;
+
+class ExceptionHandler implements ExceptionHandling
+{
+    /**
+     * @var LoggerInterface
+     */
+    private $logger;
+
+    public function __construct(LoggerInterface $logger)
+    {
+        $this->logger = $logger;
+    }
+
+    /**
+     * Report or log an exception.
+     *
+     * @param  \Exception $e
+     * @return void
+     */
+    public function report(Exception $e)
+    {
+        $this->logger->error((string) $e);
+    }
+
+    /**
+     * Render an exception into an HTTP response.
+     *
+     * @param  \Illuminate\Http\Request $request
+     * @param  \Exception               $e
+     * @return \Symfony\Component\HttpFoundation\Response
+     */
+    public function render($request, Exception $e)
+    {
+        // TODO: Implement render() method.
+    }
+
+    /**
+     * Render an exception to the console.
+     *
+     * @param  \Symfony\Component\Console\Output\OutputInterface $output
+     * @param  \Exception                                        $e
+     * @return void
+     */
+    public function renderForConsole($output, Exception $e)
+    {
+        // TODO: Implement renderForConsole() method.
+    }
+}