Lossless parser for deb822 style files

This crate contains lossless parsers and editors for RFC822 style file as used in Debian.

In addition, it has wrappers for a couple of common formats that are based on RFC822 style files:

• control - debian/control
• copyright - debian/copyright
• relations - relationship fields (Build-Depends, Depends, Provides, etc) as used in e.g. debian control files