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Use zst compression instead of xz

Use cases

ZStandard is a new file compression algorithm, the reference implementation of which, zstd, greatly outperforms every other compression method in its compression speed.

While it loses slightly to the XZ algorithm in the compression rates in some cases, the superiority in the compression speed more than makes up for it, saving time for users who package content of large size.

ZStandard/Zstd had a quick and broad adoption, being integrated into major components like the Linux kernel and Systemd, so the end user of any recent enough OS should already have zstd installed on their system.

Desired behavior

Just adding a fourth option among the existing 3 formats (zip, xz, 7z) without changing the UI would probably be enough, but it might be a good idea to instead replace the radio buttons with a dropdown menu if it somehow goes against Gnome HIG.

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Benefits of the solution

  • More choice
  • Significant time savings thanks to much faster, threaded compression

Possible drawbacks

  • None that I can come up with
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