if partyID field in config.yml is anything but 0, new players may join a party even if it contains players on red or yellow

[fallerOfFalls]

There are two ways (that I can see) to resolve this:

1. make the "main" party a special case so that if a player turns red or yellow they leave the main party, even if they are the only member. We could also add a command /join main - joins the party that new players would join.
2. remove partyID field and related code.

I'll consult with some users to see if there is even any interest in the idea of a main/default party.