Enable quick logoff and default hotkey alias

This change removes the dialog boxes that says "Are you sure you want to
quit?" when sending typed "quit" command.  It also changes the default
f12 hotkey alias from "help" to "quit."

Having a dialog box that asks you if you really want to logoff makes no
sense in the current implementation.  Logging is the most important
ability any character has.  Many players have figured out how to write
macros to alt-f4, putting other players at a disadvantage.

This change evens the playing field.  If you are being attack you can
hit F12 and log.  Everyone gets the same ability.

Also, F1 and F12 by default have the same hotkey alias bind (help) so
replacing F12 with quit makes sense.