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

src/modules/launcher/Wox.Plugin/IPlugin.cs

@@ -1,10 +1,15 @@
-using System.Collections.Generic;
+// 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.Collections.Generic;
 
 namespace Wox.Plugin
 {
     public interface IPlugin
     {
         List<Result> Query(Query query);
+
         void Init(PluginInitContext context);
     }
-}
+}