Allay 6.5.0

For Allay Server 6.7; an older backend ignores it.

• 🏷️ Name your server. server.name in config.yml (like Moonlands) is how the backend's admin panel heads your server, with the address and the MOTD under it. Allay registers it at start and on /allay reload. No two servers on a backend share a name: a taken one shows as an error in the log, and the panel shows the server's random id until you pick another.