Add swap command

[arthurmelton]

This adds the command !match swap. This command will look through all of the matches that currently going on and looks for the match that the current user is in. If it does not find a game where the user is playing then it will just give a error response. If you are in a game it will look for if the server has been setup yet. If the server has not been setup yet it will give the error message again. If the server is setup it will use the url to create the swap commands.

I also make this a new command prefix because if I understand how the groups work, you have to give permission for people to use all of the commands under that group. This makes it so that you can give users permission to use the match commands without being able to kick users. I also think this makes the command easy to remember and natural to write.

[arthurmelton]

I also realized it would say

Leiren: example.com:7777?team=0
Grenn: example.com:7777?team=1

But now it will say

Leiren: open example.com:7777?team=0
Grenn: open example.com:7777?team=1