KinectedSpace ... first pass at multi-media events: sound
  (1) finish implementation of "base" parameter to set base dir/URL
      for multi-media files.  Make it not apply to the rules/regions
      files, which have their own explicit path parameters.
  (2) implement a stepping rate for the test mode, so that the 
      test runs slowly enough that we can observe the multi-media events
  (3) pass a debug parameter from the space down through the regions,
      rules, and region events so we can control the generation of
      diagnostics for regionevents
  (4) implement sound events (works for wav files)
  (5) create a JFrame parameter that is passed to the space and
      down through the region, rules and regionevents to reveive
      displayed images.