TODO

Better organize code
Resolve TODOs in code
Don't drop errors, handle everywhere where needed (some were dropped while prototyping to speed up development)
Spigot/paper plugin to get real player IP from lazymc, reimplement ban-ip

Nice to have

Use server whitelist/blacklist
Console error if server already started on port, not through lazymc
Kick with message if proxy-to-server connection fails for new client.
Test configuration on start (server dir exists, command not empty)
Also quit lazymc after CTRL+C signal, after server has stopped
Dynamically increase/decrease server polling interval based on server state
Server polling through query (enable-query in server.properties, uses GameSpy4 protocol)

add support for more Minecraft versions (with changed protocols)
support online mode (encryption)
hold back packets (whitelist), forward to server at connect before joining
add support for forge (emulate mod list communication)
on login plugin request during login state, respond with empty payload, not supported