Two-way fixed-width <--> Python dict converter

The `fixedwidth` library provides a straightforward two-way converter for interacting with fixed-width data files or strings in Python. It facilitates easy serialization of Python dictionaries into fixed-width format and deserialization back into dictionaries, based on a user-defined configuration specification. Last updated in 2018 (v1.3), it has been used in production environments for several years and is considered stable, though not actively developed.