Removed some unnecessary usings

Author: Wumpf

IncludeToolbox/Commands/FormatIncludes.cs

@@ -1,15 +1,9 @@
 using System;
-using System.Collections.Generic;
 using System.ComponentModel.Design;
-using System.IO;
 using System.Linq;
-using Microsoft.VisualStudio.Editor;
 using Microsoft.VisualStudio.Shell;
 using Microsoft.VisualStudio.Text;
-using Microsoft.VisualStudio.PlatformUI;
 using Microsoft.VisualStudio.Text.Editor;
-using Microsoft.VisualStudio.TextManager.Interop;
-using Microsoft.VisualStudio.VCProjectEngine;
 
 namespace IncludeToolbox.Commands
 {