Weighing: Add SchemberEventScale

Elwig/App.xaml.cs

@@ -53,6 +53,8 @@ namespace Elwig {
         public static string? BranchFaxNr { get; private set; }
         public static string? BranchMobileNr { get; private set; }
         public static IList<IScale> Scales { get; private set; }
+        public static IList<ICommandScale> CommandScales => Scales.Where(s => s is ICommandScale).Cast<ICommandScale>().ToList();
+        public static IList<IEventScale> EventScales => Scales.Where(s => s is IEventScale).Cast<IEventScale>().ToList();
         public static ClientParameters Client { get; set; }
 
         public static bool IsPrintingReady => Html.IsReady && Pdf.IsReady;