Merge pull request #10 from 1e1/develop

major: manage itself the UDP

Merge pull request #9 from 1e1/develop

fix: don't update the timestamp if the NTP response has no timestamp

Merge pull request #8 from 1e1/develop

fix: syncRFC3339

v2

fix pureTick

perf++

fix RFC3339

feat: offset

ShortTimer8

fix memory leak