UDP transport for Lightyear links.
This crate provides [UdpIo], a std::net::UdpSocket-backed transport for Lightyear's
transport-neutral [Link] buffers. UDP is connectionless and packet-oriented: Lightyear's
higher-level connection, reliability, replication, and message layers are responsible for any
semantics above raw datagram delivery.
[UdpPlugin] handles single-peer UDP link entities. With the server feature enabled, the
[server] module provides [server::ServerUdpIo] and ServerUdpPlugin for a listening server
socket that creates one child [Link] per remote address.