Framework changed to WPF

Only the basic window frame is implemented.
Adjusted the structure of resource files.

Source/GrasscutterTools/Pages/PageTools.xaml

@@ -0,0 +1,24 @@
+<Page
+    x:Class="GrasscutterTools.Pages.PageTools"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+    xmlns:local="clr-namespace:GrasscutterTools.Pages"
+    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+    Title="PageTools"
+    d:Background="{StaticResource NormalBorderBrush}"
+    d:DesignHeight="420"
+    d:DesignWidth="490"
+    mc:Ignorable="d">
+
+    <Grid>
+
+        <Button
+            x:Name="BtnIdMergeTool"
+            Padding="16,8"
+            HorizontalAlignment="Center"
+            VerticalAlignment="Center"
+            Click="BtnIdMergeTool_Click"
+            Content="Id Merge Tool" />
+    </Grid>
+</Page>