Backward compatibility to the Notification library

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Author: lmbelo

src/Tools/Notification/PyTools.Notification.Channel.pas

@@ -209,6 +209,8 @@ implementation
 
 type
   //For backward compatibility
+  TCustomAttributeClass = class of TCustomAttribute;
+
   TRttiObjectHelper = class helper for TRttiObject
   public
     function GetAttribute(AAttrClass: TCustomAttributeClass): TCustomAttribute; overload;