Fix premature death of sendloop

Remove useless log

Support fallback UDP handler for server

Update dependencies

Implement android client

Skip building darwin/386

Integrate client plugin to go

Merge tag 'v1.20241021.0' into plugin

Add CC0 COPYING file.

Update circleci

Merge tag 'v1.20240513.0' into plugin

CHANGELOG for v1.20240513.0.

Update kcp-go and smux.

Update default uTLS fingerprint distribution.

Allow `-utls random` for HelloRandomizedALPN.