This uses a dictionary for the commands list, if a command has a max
args set it'll only get that amount, will call the UnkownCommand event,
and now has a built in help command that can be optionally enabled.
CommandChar is now a list, but a single character can still be used.
Externally, not much should have changed, but commands can be hidden
from the help command and a description can be set. There's probably
more that I've forgotten about.
