d918a933

Author: Greg Pfeil <greg@technomadic.org>

Committer: GitHub <noreply@github.com>

Restructure `pathway-system` (#33)

This does a lot of restructuring:

- adds `pathway-compat-*` libs for multi-layer wrappers over `base`,
`directory`, and `filepath`;
- adds `variant`-based open sum types for recovering `IO` errors; and
- has `pathway-system` depend on the new `pathway-compat-*` packages.