【yasio】轻量级跨平台socket库v3.31.2发布

yasio-3.31.2[stable]更新

1. 优化单利类模板实现，详见: https://github.com/simdsoft/yasio/issues/200
2. 修正配置宏拼写YASIO_VERBOS_LOG修正为YASIO_VERBOSE_LOG.
3. 调用bsd socket API getaddrinfo解析域名时明确传入socktype, 默认值SOCK_STREAM, 避免在mac或linux返回多个相同IP地址 , 详见: https://github.com/simdsoft/yasio/issues/201
4. 增强socket API包装类xxsocket的超时发送和接受API: send_n/recv_n实现, 详见: https://github.com/simdsoft/yasio/issues/202