优化更新代码，添加界面功能并整合

WPFluent/Controls/Scroll/SmoothScrollViewer.xaml

@@ -0,0 +1,10 @@
+<ResourceDictionary
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="clr-namespace:WPFluent.Controls">
+
+    <Style BasedOn="{StaticResource DefaultScrollViewerStyle}" TargetType="{x:Type local:SmoothScrollViewer}">
+        <Setter Property="PanningMode" Value="Both" />
+    </Style>
+
+</ResourceDictionary>