Add the ability to add aliases in the config

[kalebchoi]

I would like to have certain commands to do the same function like /l and /h. However, I think that letting the server op choose and integrate the commands they want to teleport to lobby would be more sustainable.

I also think that it would be great if you could assign certain commands to certain servers instead of having one static server that every server connects to.

I understand that this is a lot to ask for, but I think this would make the plugin 10 times more powerful. I would help, but idk java.