Added Handshake class

Fixed NetworkBuffer include
Fixed some data types
TcpClient: Added SendBytes, SetOnDisconnectCallback, SetOnConnectCallback, SetOnMessageCallback methods and made callback std::function's private and fixed some method implementations
Added AcceptConnection on TcpServer
Fixed TcpServer AddToClientsList

include/Handshake.hpp

@@ -0,0 +1,25 @@
+#ifndef HANDSHAKE_HPP
+#define HANDSHAKE_HPP
+
+#ifdef _MSC_VER
+#pragma once
+#endif
+
+#include "Defs.hpp"
+
+#include <vector>
+
+struct Handshake
+{
+	Handshake();
+	Handshake(uint16 id, byte con_code);
+	~Handshake();
+
+	static const std::vector<byte> &EncodeHandshake(const Handshake &handshake);
+	static Handshake &DecodeHandshake(const std::vector<byte> &bytes);
+
+	uint16 id;
+	byte con_code;
+};
+
+#endif