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

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

@@ -1,7 +1,9 @@
-using System;
+// 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.ComponentModel;
 using System.Runtime.CompilerServices;
-using System.Windows;
 using JetBrains.Annotations;
 
 namespace Wox.Plugin
@@ -16,4 +18,4 @@ namespace Wox.Plugin
             PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
         }
     }
-}
+}