N°3750 Allow to detect when ready scripts are done processing

In iTop 3.0.0 there are sometimes lots of scripts launched after domReady, so we needed something to know when those scripts are done !

sources/application/WebPage/NiceWebPage.php

@@ -235,4 +235,18 @@ EOF
 			)
 		);
 	}
+
+	protected function GetReadyScriptsStartedTrigger(): ?string
+	{
+		return <<<JS
+$("body").data("ready-scripts", "start");
+JS;
+	}
+
+	protected function GetReadyScriptsFinishedTrigger(): ?string
+	{
+		return <<<JS
+$("body").data("ready-scripts", "done");
+JS;
+	}
 }