renamed Will ARC-related settings and widget.

to distinguish from upcoming ShiinaRio WARC stuff.

ArcFormats/CreateARCWidget.xaml.cs

@@ -0,0 +1,15 @@
+using System.Windows.Controls;
+
+namespace GameRes.Formats.GUI
+{
+    /// <summary>
+    /// Interaction logic for CreateARCWidget.xaml
+    /// </summary>
+    public partial class CreateARCWidget : Grid
+    {
+        public CreateARCWidget ()
+        {
+            InitializeComponent ();
+        }
+    }
+}