Business Layer; finScripts.GetHtmlWidget() method to return Script or system-supplied HTML Widget

A new business layer method, finScripts.GetHtmlWidget(id) can be used to get an HTML Widget Script, or, if the id is prefixed with "HtmlWidget:", a system-supplied HTML Widget (e.g., "HtmlWidget:AccountAcceptDecline").

NOTE: This function returns a finScriptExecutable object which will vary between finScript or finScriptRO depending on whether a system-supplied HTML Widget is being retrieved.