Liquidsoap 2.1.1

This is the first bugfix release of the v2.1.x release cycle, fixing some minor and less-minor issues. So far, the release cycle seems to be holding up fairly well!

Worth noting:

• ocurl is now a mandatory dependency. Its functionalities, support for http.{get,put,post,..} providing, among other things, remote requests resolution, were already expected by most users.
• Windows build for v2.1.0 did not have the ffmpeg encoders and decoders enabled.. 🤦‍♂️
• playlist.next now returns the requests in the right order. This could be breaking some existing scripts!
• playlist.remaining has been renamed into playlist.remaining_files. This could be breaking some existing scripts!

Full changelog:

2.1.1 (2022-08-28)

New:

• Added process.quote.command to generate complex quoted command strings suitable
  for use with process.run and os-independent.

Changed:

• Renamed playlist.remaining into playlist.remaining_files (#2524)
• Added id argument to replaygain operator (#2537).
• Made ocurl dependency required, added uri as required dependency (#2551)

Fixed:

• Fixed missing ffmpeg features on windows build.
• Fixed sync issues with ffmpeg.encode.* inline encoders (#2584)
• Fixed http.get issues when user-agent was not set (#2517)
• Fixed order of playlist.next returned requests.
• Fixed infinite loop when reloading a failed playlist (#2576)
• Fixed http requests with urls containing spaces (#2551)
• Fixed on_connect type for srt inputs and outputs.
• Fixed parsing issues with functions/variables definitions
  beginning with rec or replaces (#2560)
• Fixed infinite parse error loop (#2527)
• Fixed empty initial mp4 HLS segment.
• Prevent initial start for autostart and fallible sources.