Added virtual method to provide custom Event Handler summary

Assets/Fungus/FungusScript/Editor/FungusScriptWindow.cs

@@ -386,7 +386,13 @@ namespace Fungus
 				EventHandlerInfoAttribute info = EventHandlerEditor.GetEventHandlerInfo(sequence.eventHandler.GetType());
 				if (info != null)
 				{
-					nodeName = "(" + info.EventHandlerName + ")\n";
+					string handlerSummary = sequence.eventHandler.GetSummary();
+					if (handlerSummary == "")
+					{
+						handlerSummary = info.EventHandlerName;
+					}
+
+					nodeName = "(" + handlerSummary + ")\n";
 					nodeStyle.padding.top = 23; // Adjust label to fit on two lines
 
 				}

Assets/Fungus/FungusScript/Scripts/EventHandler.cs

@@ -48,5 +48,15 @@ namespace Fungus
 			FungusScript fungusScript = parentSequence.GetFungusScript();
 			return fungusScript.ExecuteSequence(parentSequence);
 		}
+
+		/**
+		 * Returns a custom summary for the event handler.
+		 * If the string is empty, the editor will use the EventHandlerName property of 
+		 * the EventHandlerInfo attribute instead.
+		 */
+		public virtual string GetSummary()
+		{
+			return "";
+		}
 	}
 }