smaller stylecop fixes in Wox.Core and Wox.Infra (#5671)

* Headers
unneeded usings
files need blank line at bottom
Fixed double returns
Returns after braces

* commenting out stylecop

src/modules/launcher/Wox.Infrastructure/Hotkey/KeyEvent.cs

@@ -1,3 +1,7 @@
+// 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.
+
 namespace Wox.Infrastructure.Hotkey
 {
     public enum KeyEvent
@@ -22,4 +26,4 @@ namespace Wox.Infrastructure.Hotkey
         /// </summary>
         WM_SYSKEYDOWN = 260
     }
-}
+}