JC version 1.15.2

• Add systeminfo parser tested on Windows
• Update dig parser to fix an issue with IPv6 addresses in the server field
• Update dig parser to fix an issue when axfr entries contain a semicolon
• Update dig parser to add support for Additional Section and Opt Pseudosection
• Update dig parser to add query_size field
• Use dig parser as the main example in readme, documentation, and man page
• Standardize int, float, and boolean conversion rules with functions in jc.utils

Release Notes: https://blog.kellybrazil.com/2021/04/07/jc-version-1-15-0-released/