New configuration variable, log_to_file

Shutdown function added to TcpClient
Shutdown function added to TcpServer
Renamed socket to server_tcp_socket in TcpServer
Implemented ConfigReader class

include/TcpClient.hpp

@@ -21,6 +21,8 @@ public:
 	TcpClient(const std::string &ip, uint16 port = default_client_port);
 	~TcpClient();
 
+	void Shutdown();
+
 	const std::string &GetIP();
 	void SetIP(const std::string &ip);