• add Spotify integration that doesn't depend on libspotify
• partial support for AirPlay events (Homepod buttons)
• web UI upgraded, now 1.1.0:
  • show "comment" field in track details
  • drop double login to Spotify when not using libspotify
• easier install by letting 'make install' add user and service files
• preserve existing conf file when running 'make install'
• support for "comment" field when making smart playlists
• fix support for dacp device-volume
• fix issue where source file sort tags where ignored
• fix for Roku (RSP) artist display issue
• fix bug when 'bind_address' option is used
• fix for CVE-2021-38383
• fix some minor time-of-check time-of-use bugs