Minor filter update.
Multi-login check checks other telnet logins as well.

Conflicts:
	Chatters.dme
Removed who() from /client. Command only uses verbs under /mob, making this useless.
GameManager.UpdateWho() no longer spams telnet clients.

Conflicts:
	code/controllers/managers/gameman.dm
Welcome message no longer missing line break.
AFK messages respects show_colors.
Disabled Send() for telnet clients.
Added who() verb for telnet clients.

Conflicts:
	Chatters.dme
Added help for telnet clients.

Conflicts:
	Chatters.dme
	code/models/chatter/commands.dm