- improved error handling for PHP Runtime errors

- upgraded [_Raphaël_](https://dmitrybaranovskiy.github.io/raphael) js lib `v2.1.2` → `v2.2.8`

app/main/controller/controller.php

@@ -764,17 +764,27 @@ class Controller {
                 $return->error[] = $error;
                 echo json_encode($return);
             }else{
+                // non AJAX (e.g. GET/POST)
+                // recursively clear existing output buffers
+                while(ob_get_level()){
+                    ob_end_clean();
+                }
+
                 $f3->set('tplPageTitle', 'ERROR - ' . $error->code);
                 // set error data for template rendering
                 $error->redirectUrl = $this->getRouteUrl();
                 $f3->set('errorData', $error);
 
+                // 4xx/5xx error -> set error page template
                 if( preg_match('/^4[0-9]{2}$/', $error->code) ){
-                    // 4xx error -> render error page
                     $f3->set('tplPageContent', Config::getPathfinderData('STATUS.4XX') );
                 }elseif( preg_match('/^5[0-9]{2}$/', $error->code) ){
                     $f3->set('tplPageContent', Config::getPathfinderData('STATUS.5XX'));
                 }
+
+                // stop script - die(); after this fkt is done
+                // -> unload() fkt is still called
+                $f3->set('HALT', true);
             }
         }