BP3D Generic utilities

Features

• env Utilities to work with environment variables.
• tzif Utilities to decode compiled TZ data (ex: /etc/localtime).
• simple-error Generate simple enum based error types.
• result Extensions to the result type (useful for CLI apps).
• path Extensions to Path which do not depend on OS-level functions.

lib.rs:

Generic utilities not tied to any particular platform for use with other BP3D software.