pipes: add security descriptor to limit access to the pipe to the current user

pageant-pipe: add pageant pipe support

cygwin client: add logs

common: avoid leaking goroutine (close handler)

cygwin: speedup connection by using IPv4 localhost

wsl: on shutdown of wsl server, remove socket file

main: do os.Exit when doing multiple Exit requests

log: better logging

log: don't use log.Fatal to be able to cleanup systray

pageant: fix stopping server

connections: only connect when handling a query

use agent context struct for better shutdown handling

add license (MIT)

README.md: remove leftover path

ci: build 2 versions: one with console and one without