add some styles

add Separator and StatusBar style

src/Shared/HandyControl_Shared/Themes/Styles/Base/SeparatorBaseStyle.xaml

@@ -0,0 +1,8 @@
+<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+
+    <Style x:Key="SeparatorBaseStyle" TargetType="Separator">
+        <Setter Property="Background" Value="{DynamicResource BorderBrush}"/>
+    </Style>
+
+</ResourceDictionary>