Add missing Usings (broken by ReSharper using optimization because with TRACE defined, nothing uses System.Diagnostics)

Author: nuclearmistake

XmlRpc_Wrapper/XMLRPCCallWrapper.cs

@@ -17,6 +17,8 @@
 
 #endregion
 
+using System.Diagnostics;
+
 namespace XmlRpc_Wrapper
 {
 #if !TRACE

XmlRpc_Wrapper/XmlRpcDispatch.cs

@@ -16,6 +16,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Net.Sockets;
 
 #endregion

XmlRpc_Wrapper/XmlRpcServer.cs

@@ -15,6 +15,7 @@
 //#define REFDEBUG
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.IO;
 using System.Net;
 using System.Net.Sockets;

XmlRpc_Wrapper/XmlRpcSource.cs

@@ -13,6 +13,7 @@
 #region USINGZ
 
 using System;
+using System.Diagnostics;
 using System.Net.Sockets;
 using System.Text;
 

XmlRpc_Wrapper/XmlRpcValue.cs

@@ -14,6 +14,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.IO;
 using System.Reflection;
 using System.Xml;