console: missing vars
console: use utils.sleepMs
document unicode characters
Use util.format for Console print functions

Should be basically backwards compatible (they both join on spaces) but
has the following advantages:

- Objects are printed with util.inspect rather than toString, which
  means no more [object Object].  (We shouldn't be passing objects to
  end-user messages, but they can be useful in Console.debug.)

- The first string can optionally be a printf-style format string, if
  that's a better fit for your message.