migrate externalAgendas-controller to full plugin manager

application/modules/admin/controllers/ExternalAgendasController.php

@@ -21,6 +21,11 @@
 
 
 class Admin_ExternalAgendasController extends ZendAfi_Controller_Action {
+  public function getPlugins() {
+    return ['ZendAfi_Controller_Plugin_Manager_Manager'];
+  }
+
+
   public function getRessourceDefinitions() {
     return
       [

library/ZendAfi/Controller/Plugin/Manager/Manager.php

@@ -20,7 +20,7 @@
  */
 
 
-abstract class ZendAfi_Controller_Plugin_Manager_Manager extends ZendAfi_Controller_Plugin_Abstract {
+class ZendAfi_Controller_Plugin_Manager_Manager extends ZendAfi_Controller_Plugin_Abstract {
 
   public function acceptVisitor($visitor) {
     $visitor->visitGetForm(function($model)