Issue/1741 semantic search actions

coscine/issues#1741

src/Action/EventArgs/ActionEventArgs.cs

@@ -11,12 +11,11 @@ namespace Coscine.Action.EventArgs
         public object[] Args { get; set; }
         public bool SilentMode { get; set; } = false;
 
-        public ActionEventArgs()
+        protected ActionEventArgs()
         {
-
         }
 
-        public ActionEventArgs(object[] args)
+        protected ActionEventArgs(object[] args)
         {
             Args = args;
         }