removed mahapps dep, did lighter weight ControlzEx. Need to add these to WSX

src/modules/imageresizer/tests/Properties/AppFixture.cs

@@ -26,6 +26,7 @@ namespace ImageResizer.Properties
             {
                 if (disposing)
                 {
+                    _imageResizerApp.Dispose();
                     _imageResizerApp = null;
                 }