added new onFlexDirectoryConfigBeforeSave event

Signed-off-by: Andy Miller <rhuk@mac.com>

system/src/Grav/Framework/Flex/FlexDirectory.php

@@ -31,6 +31,7 @@ use Grav\Framework\Flex\Interfaces\FlexStorageInterface;
 use Grav\Framework\Flex\Storage\SimpleStorage;
 use Grav\Framework\Flex\Traits\FlexAuthorizeTrait;
 use Psr\SimpleCache\InvalidArgumentException;
+use RocketTheme\Toolbox\Event\Event;
 use RocketTheme\Toolbox\File\YamlFile;
 use RocketTheme\Toolbox\ResourceLocator\UniformResourceLocator;
 use RuntimeException;
@@ -269,6 +270,12 @@ class FlexDirectory implements FlexDirectoryInterface
             $filename = "{$dirname}/{$basename}";
         }
 
+        $grav->fireEvent('onFlexDirectoryConfigBeforeSave', new Event([
+            'directory' => $this,
+            'name' => $name,
+            'data' => &$data,
+        ]));
+
         $file = YamlFile::instance($filename);
         if (!empty($data)) {
             $file->save($data);