Our git version is v2+ for some time now, but go.mod
still declared v1. Hopefully making both match makes
https://pkg.go.dev/github.com/rfjakob/gocryptfs/v2 work.
All the import paths have been fixed like this:
find . -name \*.go | xargs sed -i s%github.com/rfjakob/gocryptfs/%github.com/rfjakob/gocryptfs/v2/%
This really only handles scrypt and no other key-derivation functions.
Renaming the files prevents confusion once we introduce HKDF.
renamed: internal/configfile/kdf.go -> internal/configfile/scrypt.go
renamed: internal/configfile/kdf_test.go -> internal/configfile/scrypt_test.go