Rethink the way we create the serverID #147
Description
We currently use the label https://github.com/creesch/minecraft-web-chat/blob/main/src/client/java/dev/creesch/util/MinecraftServerIdentifier.java#L73
Which can and will change as I realized with the shutdown messages for the tildes server. This will mess with the server history, so we probably want to default to the address instead.
We might also want to have a little bit of a migration path for a couple of releases. Something where on server join we do a quick check if someone has server history under the old and if that is positive we do a quick update statement to update all entries for that server to the new format. Should be relatively straightforward.