now supports both fuse2 and fuse3
fallback on fuse.py (fuse2-only) if mfusepy unavailable
fuse3 is 20% faster on large files,
fuse2 == fuse3 on small files
motivated by nixos dropping fuse2 in NixOS/nixpkgs#522340
npm is no longer able to build it, and the build output
never changed since copyparty v0.11.20 (2021-06-20) /
asmcrypto 2821dd1dedd1196c378f5854037dda5c869313f3 (2018-12-02)
one final pass of reasonable size-golfing was done by hand
deflated with pigz -11 -I250