sio_socket, websocket的使用与封装

工程代码地址为：https://download.youkuaiyun.com/download/f110300641/10784562

简单的测试：

#include <iostream>
#include <thread>
#include <string>
#include <chrono>

#include "rapidjson/document.h"
#include <rapidjson/writer.h>
#include <rapidjson/stringbuffer.h>
#include <rapidjson/prettywriter.h>

#include "tg_client_mgr.h"

std::string login_json()
{
    rapidjson::Document doc;
    rapidjson::Document::AllocatorType& Allocator = doc.GetAllocator();

    rapidjson::Value root( rapidjson::kObjectType );
    rapidjson::Value child( rapidjson::kObjectType );

    root.AddMember( "cmd", "login", Allocator );

    child.AddMember( "user_name", "COLLECTOR", Allocator );
    child.AddMember( "use