Mentioned previously in #19.

Relevant methods:

• net.minecraft.server.PlayerManager::onPlayerConnect (onConnect)
• net.minecraft.server.PlayerManager::remove (onDisconnect)

Creating mixins to fire the events seems simple as there are already Mojang hooks in place.

I can submit a PR if it is likely to get accepted.

@SquidDev What's the status of #34?

I'd say this is somewhat covered by #605

Closing since this has been implemented in ServerPlayConnectionEvents