Build in queue waiting feature to task_submitter

[miketynes]

A common pattern in Thinker methods decorated with task_submitter is to begin with something like

while True:
  try:
    data = self.queue.get(block=True, timeout=1)
  except Empty:
    if self.done.is_set():
      return
  else:
    break

having this be an optional feature of the task_submitter is desirable to reduce boilerplate and provide this functionality to users directly