Code cleanup

Fixed code style using CodeMaid.

NSspi/EnumMgr.cs

@@ -1,8 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Reflection;
-using System.Text;
 
 namespace NSspi
 {
@@ -57,4 +54,4 @@ namespace NSspi
             throw new ArgumentException( "Could not find a matching enumeration value for the text '" + text + "'." );
         }
     }
-}
+}