Added custom whoops-based debug view

Provides a simple bookstack focused view that does not rely on JavaScript.
Contains links to BookStack specific resources in addition to commonly
desired debug details.

app/Exceptions/WhoopsBookStackPrettyHandler.php

@@ -0,0 +1,51 @@
+<?php
+
+namespace BookStack\Exceptions;
+
+use Whoops\Handler\Handler;
+
+class WhoopsBookStackPrettyHandler extends Handler
+{
+
+    /**
+     * @return int|null A handler may return nothing, or a Handler::HANDLE_* constant
+     */
+    public function handle()
+    {
+        // TODO - Assistance View
+        // Docs links
+        // Discord Links
+        // Github Issue Links (With pre-filled search?)
+
+        $exception = $this->getException();
+        echo view('errors.debug', [
+            'error' => $exception->getMessage(),
+            'errorClass' => get_class($exception),
+            'trace' => $exception->getTraceAsString(),
+            'environment' => $this->getEnvironment(),
+        ])->render();
+        return Handler::QUIT;
+    }
+
+    protected function safeReturn(callable $callback, $default = null) {
+        try {
+            return $callback();
+        } catch (\Exception $e) {
+            return $default;
+        }
+    }
+
+    protected function getEnvironment(): array
+    {
+        return [
+            'PHP Version' => phpversion(),
+            'BookStack Version' => $this->safeReturn(function() {
+                $versionFile = base_path('version');
+                return trim(file_get_contents($versionFile));
+            }, 'unknown'),
+            'Theme Configured' => $this->safeReturn(function() {
+                    return config('view.theme');
+                }) ?? 'None',
+        ];
+    }
+}