rust-chg: reimplement attach_io operation as async function
In short, MessageLoop<Connection> was redesigned as Protocol<Connection>,
and the protocol methods no longer consume self.
API changes are briefly documented in the following page:
https://docs.rs/tokio-hglib/0.3.0/tokio_hglib/struct.Protocol.html
Differential Revision: https://phab.mercurial-scm.org/D8442
// Copyright 2018 Yuya Nishihara <yuya@tcha.org>
//
// This software may be used and distributed according to the terms of the
// GNU General Public License version 2 or any later version.
mod attachio;
//mod clientext;
//pub mod locator;
pub mod message;
pub mod procutil;
//mod runcommand;
//mod uihandler;
//pub use clientext::ChgClientExt;
//pub use uihandler::{ChgUiHandler, SystemHandler};