Log Message:
Version 3.4:

Improvements:
* miniterm: suspend function (temporarily release port, Ctrl-T s)
* context manager automatically opens port on __enter__
* list_ports: add interface number to location string
* protocol_socket: Retry if BlockingIOError occurs in reset_input_buffer.

Bugfixes:
* list_ports: option to include symlinked devices
* list_ports: workaround for special characters in port names

Bugfixes (posix):
* allow calling cancel functions w/o error if port is closed
* protocol_socket: sync error handling with posix version
* posix: ignore more blocking errors and EINTR, timeout only applies to blocking I/O
* fix: port_publisher typo