* ReplayGain support
- extract ReplayGain tags from files, expose via native api
- use metadata to normalize audio in web player
* make pre-push happy
* remove unnecessary prints
* remove another unnecessary print
* add tooltips, see metadata
* address comments, use settings instead
* remove console.log
* use better language for gain modes
* Refactor session_keys to its own package
* Adjust play_tracker
- Don't send external NowPlaying/Scrobble for tracks with unknown artist
- Continue to the next agent on error
* Implement ListenBrainz Agent and Auth Router
* Implement frontend for ListenBrainz linking
* Update listenBrainzRequest
- Don't marshal Player to json
- Rename Track to Title
* Return ErrRetryLater on ListenBrainz server errors
* Add tests for listenBrainzAgent
* Add tests for ListenBrainz Client
* Adjust ListenBrainzTokenDialog to handle errors better
* Refactor listenbrainz.formatListen and listenBrainzRequest structs
* Refactor agent auth_routers
* Refactor session_keys to agents package
* Add test for listenBrainzResponse
* Add tests for ListenBrainz auth_router
* Update ListenBrainzTokenDialog and auth_router
* Adjust player scrobble toggle
* Auto theme preference added
* Fix lint
* Add and use AUTO from consts
* Add shared custom hook to get current theme
* Moved up 'Auto' choice
* AUTO -> AUTO_THEME_ID & extract useCurrentTheme to file
* Liberalise theme setting
* Add tests
