新增了对NodeaAction特性标记方法中，对params可变参数的支持

Workbench/Node/RelayCommand.cs

@@ -0,0 +1,26 @@
+using System.Windows.Input;
+
+namespace Serein.Workbench.Node
+{
+
+    public class RelayCommand : ICommand
+    {
+        private readonly Action<object> _execute;
+        private readonly Func<object, bool> _canExecute;
+
+        public RelayCommand(Action<object> execute, Func<object, bool> canExecute = null)
+        {
+            _execute = execute;
+            _canExecute = canExecute;
+        }
+
+        public event EventHandler CanExecuteChanged;
+
+        public bool CanExecute(object parameter) => _canExecute == null || _canExecute(parameter);
+
+        public void Execute(object parameter) => _execute(parameter);
+
+        public void RaiseCanExecuteChanged() => CanExecuteChanged?.Invoke(this, EventArgs.Empty);
+    }
+
+}