[WIP] Songlist webserver

[irgendwr]

based on / continuation of #852

Contributions are welcome! feel free to reach out if you're interested

Additions:

• (improved performance of original prototype)
• dark/light theme
• added cover/background/audio/video/file API: /song/<index>/<cover/background/audio/video/file
• added JSON API: /songlist.json
• (implemented HTTP routing)

What's still missing:

• good UI/UX
  • add a cover grid view, especially for mobile
  • better list view (with cover and more details)
  • show more details on click + audio (and video?) preview
• option to add song into a queue (or alternatively a playlist at first)
• add config options:
  • enable/disable the webserver
  • change the port
  • (dis-)allow queue
  • (dis-)allow audio/video preview
• maybe show a QR code in the UI for ease of sharing?

Known issues:

• something is wrong with the try catches. no response is sent on errors

[bohning]

Woohoo, thanks a lot for picking up on this and your contributions!

[basisbit]

please make the port configurable, but set it to strictly only listen on localhost. If people want to have it reachable over network, this forces them to put at the very least a tiny bit of effort into setting up a reverse proxy, which then hopefully has much less attack surface than the old UWebServer.