优化更新代码，添加界面功能并整合

WPFluent/Controls/IconElement/IIconControl.cs

@@ -0,0 +1,15 @@
+
+
+
+namespace WPFluent.Controls;
+
+/// <summary>
+/// Control that allows you to set an icon in it with an <see cref="Icon"/>.
+/// </summary>
+public interface IIconControl
+{
+    /// <summary>
+    /// Gets or sets displayed <see cref="IconElement"/>.
+    /// </summary>
+    IconElement? Icon { get; set; }
+}