Spotify and playlists related fixes

Edit: the version reported by the app is still 2.0.2beta4, it's a bug, it will be fixed in the next version.

What's Changed

• merge fixes to fastapi-dev branch by @moddroid94 in #411
• fix(ui): submit the parse form once on Enter by @jhyang21 in #414
• fix(spotify): recover from a dead librespot session by @jhyang21 in #418
• fix(spotify): load playlists through librespot's playlist service by @jhyang21 in #421
• fix: two regressions from the QueueItem migration (fe68756) by @jhyang21 in #426

Full Changelog: v2.0.2beta4...v2.0.3