use rand port instead of sequential pattern

add multiport support on server

config --crypt null (#878)

upd deps

upd deps to smux to v1.5.16

enable support for Apple M1

remove a duplicated logging

Support Apple M1 Mac (#823)

See issue https://github.com/xtaci/kcptun/issues/822

Co-authored-by: apple <apple@abc.net>

upgrade to kcp-go@v5.6.1

add missing vendor files