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

src/modules/launcher/PowerLauncher/Helper/KeyboardHelper.cs

@@ -1,6 +1,7 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
+// 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 System.Windows.Input;
 using Wox.Plugin;