Print items relative root when its specified

Add a command to steal this script

Apply CC0 license

Fix --root and --manifest arguments

Merge branch 'tests'

More tests

Simplify tests by assuming cwd == temporary directory

Rework example.json handling

Check SHA256 when adding files

Check README

Add badge to the README

Add a .build.yml specification

Add a pyproject.toml-style project

Add basic test

Add help-text for the --root and --manifest arguments

Add initial README

Print relative paths

Add option to download specified targets

Fix root resolution

Add initial lock-file-style implementation