Private replies for commands

The private replies can be notices too!

Bonus secret feature: "command-reply" formatting entry, which can have
%realSender% to highlight the user who sent the command.
ConsoleListener: check for /me and /say correctly

Split by spaces just like CraftIRCListener does. Before this, commands
such as "/metrics reload" would get interpreted as "/me rics reload".

Also added empty fields such as realSender/prefix/suffix.

This class looks like a bit like it's copypasted from CraftIRCListener
but there are slight differences such as .getCommand()
Relay cancelled joins/quits through cancelled tag

This is probably a case of "blame other plugins" but that's actually
what the cancelled tag is usually meant to solve, so why not?
ircsay: show help when sending empty messages

Found this patch buried in one of my old branches.
Configurable stopped responding message

I'm not sure if i'll want to get this merged in later.
Allow blank stopped responding message to disable it