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

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

@@ -1,8 +1,13 @@
-namespace Wox.Plugin
+// 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.Plugin
 {
     public class PluginPair
     {
         public IPlugin Plugin { get; internal set; }
+
         public PluginMetadata Metadata { get; internal set; }