refactor ImageBrowser, add NumericUpDown, delete info controls

HandyControlDemo/UserControl/Controls/NumericUpDownDemoCtl.xaml

@@ -0,0 +1,11 @@
+<UserControl x:Class="HandyControlDemo.UserControl.NumericUpDownDemoCtl"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:controls="clr-namespace:HandyControl.Controls;assembly=HandyControl"
+             Background="White">
+    <controls:TransitioningContentControl>
+        <StackPanel Margin="32">
+            <controls:NumericUpDown x:Name="NumericUpDown" Width="240"/>
+        </StackPanel>
+    </controls:TransitioningContentControl>
+</UserControl>

HandyControlDemo/UserControl/Controls/NumericUpDownDemoCtl.xaml.cs

@@ -0,0 +1,11 @@
+// ReSharper disable once CheckNamespace
+namespace HandyControlDemo.UserControl
+{
+    public partial class NumericUpDownDemoCtl
+    {
+        public NumericUpDownDemoCtl()
+        {
+            InitializeComponent();
+        }
+    }
+}