优化更新代码，添加界面功能并整合

WPFluent/Input/IRelayCommand{T}.cs

@@ -0,0 +1,25 @@
+using System.Windows.Input;
+
+namespace WPFluent.Input;
+
+/// <summary>
+/// A generic interface representing a more specific version of <see cref="IRelayCommand"/>.
+/// </summary>
+/// <typeparam name="T">The type used as argument for the interface methods.</typeparam>
+public interface IRelayCommand<in T> : IRelayCommand
+{
+    /// <summary>
+    /// Provides a strongly-typed variant of <see cref="ICommand.CanExecute(object)"/>.
+    /// </summary>
+    /// <param name="parameter">The input parameter.</param>
+    /// <returns>Whether or not the current command can be executed.</returns>
+    /// <remarks>Use this overload to avoid boxing, if <typeparamref name="T"/> is a value type.</remarks>
+    bool CanExecute(T? parameter);
+
+    /// <summary>
+    /// Provides a strongly-typed variant of <see cref="ICommand.Execute(object)"/>.
+    /// </summary>
+    /// <param name="parameter">The input parameter.</param>
+    /// <remarks>Use this overload to avoid boxing, if <typeparamref name="T"/> is a value type.</remarks>
+    void Execute(T? parameter);
+}