0.3.0

Changed

• The entire metadata retrieval approach has been fundamentally
  rewritten, based on a much deeper understanding of the message and
  field format, thanks to tips and sample code from @awwright.
• This led to a deep refactoring of the library, and a split into
  several packages, now that there are many more classes to support
  all of these new features. API compatibility was not maintained with
  previous releases.

Added

• Many more kinds of information can be retrieved from players, and
  the classes and API documentation have been enriched to reflect our
  deepening understanding of the protocol.
• Metadata cache files can be created by downloading either entire
  collections or individual playlists from players on the network, and
  then attached for use in environments (such as busy shows with four
  physical players) where metadata queries are not reliable.
• Metadata cache files can be monitored for automatic attachment to
  player ports when media that matches the cache is mounted by the
  player.
• New listener interfaces to provide information about changes to the
  available metadata caches, as well as changes to metadata about
  tracks loaded in players on the network.

Fixed

• The approach to concurrency was examined carefully, and almost all
  synchronized methods were eliminated in favor of newer concurrent
  classes for improved performance and safety.
• When the last device disappears from the Pro DJ Link network, we
  clear the DeviceFinder's notion of when we first saw one, so that
  the VirtualCDJ's device-number conflict-avoidance code can work
  properly when we later encounter a new network.