Rewrite vsvg-cli using bpaf#153
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This PR is a complete rewrite of
vsvg-cli.I initially used
clapas the "ecosystem default" CLI toolkit, but it unfortunately doesn't have support for command chaining (yet? clap-rs/clap#2222). As a result,vsvg-clihad an extremely bad, for-tests-only CLI UX.With this PR, vsvg-cli now uses
bpaf, which has a pretty good support for command chaining, which means that vsvg-cli now has a much improved CLI UX, similar to vpype.Specifically, this PR: