Pyrekordbox v0.3.1

What's Changed

This release improves the Rekordbox v6 database key extraction and adds a new handler for smart playlists.

New Features

• add method to return the contents of a playlist in the RBv6 db directly
  The database can now be queried directly for the contents contained in a playlist.
  This works for regular playlists as well as for smart playlists.
  The full DjmdContent instances of specific columns can be returned.
• add RBv6 smart playlist handler
  Add a handler for the smart playlists of Rekordbox. The conditions are stored as an
  XML string. The smart playlist handler supports parsing and writing the XML string.
• add DB key extraction method for newer Rekordbox versions (#97).
  The key can now also be extracted with newer Rekordbox versions.
  frida is used to inject code to intercept the key when the DB is opened.

Improvements/Bug Fixes

• populate configuration just-in-time
  Previously the config was populated when importing pyrekordbox.
  Now the config is updated the first time it is used.
• use association proxies in DjmdContent table
  This makes it possible to filter queries using these associations,
  for example DjmdContent.ArtistName
• add Playlist type enums and attributes

Full Changelog: 0.3.0...v0.3.1