botify 1.6.4

album covers, automatic Spotify track selection, automatic playback cleanup and other improvements

• when searching a Spotify track, botify now automatically picks the best result based on the likeness of the track names, track popularity and how popular each artist is in this guild
  • a selection of spotify tracks to choose from can now be fetched using the refactored "select" (formerly "limit") argument
  • the refactored "select" argument also does not necessarily require a value anymore but uses 10 (for YouTube) or 20 (for Spotify) as default value
• added album covers to the queue and "now playing..." widgets for Spotify tracks
• added a periodic task that resets playback settings and queues after an hour of inactivity to preserve resources and ensure long term stability
  • created framework to implement such tasks as cron jobs
• questions now get deleted when they are answered or otherwise destroyed either by timing out or being replaced by a different question and "still loading..." messages disappear once the reference command is finished
• other improvements and fixes
• backend improvements:
  • Launcher: make sure all guilds are setup within one session instead
    of opening and closing a new one for each by wrapping the loop
    inside one StaticSessionProvider#invokeWithSession call to make sure
    a thread session is setup and closed after all guilds are done
    • also setup guilds before running the startup tasks as some might
      require a guild context which meant guilds were set up twice,
      once implicitly when needed in the task and once explicitly when
      setting up the guilds later
  • VersionUpdateAlertTask: make sure all guilds are handled within one
    session instead of opening and closing one for each when sending an
    update alert to each guild
• added number of currently active guilds to the analytics command
• when loading playlists videos that were originally redirected Spotify tracks are now loaded and treated as Spotify tracks using the new BulkOperationService