fixing most whitespace issues, reordering namespaces and adding in headers (#5677)

src/modules/launcher/Wox.Test/MainViewModelTest.cs

@@ -1,4 +1,8 @@
-using NUnit.Framework;
+// Copyright (c) Microsoft Corporation
+// The Microsoft Corporation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using NUnit.Framework;
 using System;
 using System.Collections.Generic;
 using System.Text;