Revert RakNet source files back to the original v2.518 state

* Add RakNet source files to the VS project

raknet/ClientContextStruct.h

@@ -0,0 +1,50 @@
+/// \file
+/// \brief \b [Internal] Depreciated, back from when I supported IO Completion ports.
+///
+/// This file is part of RakNet Copyright 2003 Kevin Jenkins.
+///
+/// Usage of RakNet is subject to the appropriate license agreement.
+/// Creative Commons Licensees are subject to the
+/// license found at
+/// http://creativecommons.org/licenses/by-nc/2.5/
+/// Single application licensees are subject to the license found at
+/// http://www.rakkarsoft.com/SingleApplicationLicense.html
+/// Custom license users are subject to the terms therein.
+/// GPL license users are subject to the GNU General Public
+/// License as published by the Free
+/// Software Foundation; either version 2 of the License, or (at your
+/// option) any later version.
+
+#ifndef __CLIENT_CONTEXT_STRUCT_H
+#define __CLIENT_CONTEXT_STRUCT_H
+
+#ifdef _COMPATIBILITY_1
+#elif defined(_WIN32)
+//#include <windows.h>
+#endif
+#include "NetworkTypes.h"
+#include "MTUSize.h"
+
+class RakPeer;
+
+#ifdef __USE_IO_COMPLETION_PORTS
+
+struct ClientContextStruct
+{
+	HANDLE handle; // The socket, also used as a file handle
+};
+
+struct ExtendedOverlappedStruct
+{
+	OVERLAPPED overlapped;
+	char data[ MAXIMUM_MTU_SIZE ]; // Used to hold data to send
+	int length; // Length of the actual data to send, always under MAXIMUM_MTU_SIZE
+	unsigned int binaryAddress;
+	unsigned short port;
+	RakPeer *rakPeer;
+	bool read; // Set to true for reads, false for writes
+};
+
+#endif
+
+#endif