Promote queue's performance.

direct_send_msg support batch operation.
Introduce virtual function type_name() and type_id() to ascs::socket, they can identify whether a given two ascs::socket has the same type.
Drop the native parameter from i_packer::pack_msg(msg_type&& msg, ...).

Delegate supression of memory replication to packers, so rename i_packer::pack_header to another overload of pack_msg.
See built-in packers for more details.

Introduce virtual function pack_header to i_packer, it just pack headers.
Add an overload to send_(native_)msg, safe_send_(native_)msg, sync_send_(native_)msg and sync_safe_send_(native_)msg respectively, it accepts a in_msg_type&& parameter,
 this will reduce one memory replication (needs i_packer::pack_header).
Drop ascs::list which was implemented by ascs before, just simply use std::list, which means list::size() will not be called any more.

Use i_matrix to remould demo socket_management.

Make client_socket_base be able to call multi_client_base (via i_matrix) like server_socket_base call server_base (via i_server),
 and so does ssl::client_socket_base and udp::socket_base.

Fix repetitive binding.