Debounce wants

[dirkmc]

Currently we debounce sending wants by a millisecond. If a client sends continuous requests at a higher frequency than the debounce time, the request will never be sent.

Proposed Solution:
Add a debounce function to the message queue that takes two parameters:

• debounce time
  wait at least this interval after the last invocation before calling the target function
• max time
  if we're still debouncing after this amount of time, don't wait any more, call the target function anyway