[ATTACHMENTS] Further refactoring

Some key points:
- Components and Plugins shouldn't extend Module directly
- Avatars should be fetched via GSActor ID, not by nickname as that isn't unique
- Avatar now is a separate Component
- Common file utilities are now to be placed in Core\GSFile, this will
  handle storage and trigger validation
- Some bug fixes

components/Left/Left.php

@@ -21,11 +21,11 @@ namespace Component\Left;
 
 use App\Core\Event;
 use App\Core\Log;
-use App\Core\Modules\Module;
+use App\Core\Modules\Component;
 use App\Util\Common;
 use Exception;
 
-class Left extends Module
+class Left extends Component
 {
     public function onEndTwigPopulateVars(array &$vars)
     {