• fix memory leak
• fixed ssl handling: the sslconnected class incorrectly cached the readability/writability state of a socket
• TcpResolver: reduce risk of accessing destructed TcpConnection
• Monitor: avoid null pointer dereference when copying instances
• cleanup fixes in linux-tcp
• channel should be movable
• tcpchannel should also be movable
• onError should be overloaded by subclass, otherwise callback installers are no longer available for that class.