Added Theme Editor window and added to Tools menu

Filtration.ThemeEditor/ViewModels/ThemeEditorViewModel.cs

@@ -0,0 +1,14 @@
+using Filtration.Interface;
+
+namespace Filtration.ThemeEditor.ViewModels
+{
+    public interface IThemeEditorViewModel : IDocument
+    {
+    }
+
+    public class ThemeEditorViewModel : IThemeEditorViewModel
+    {
+        public bool IsScript { get { return false; }}
+        public string Title { get { return "Theme Editor"; } }
+    }
+}