Jc

- Update ping parser for Raspberry Pi compatibility

- Add key/value file parser (wrapper for ini parser)
- Add date command parser
- Update traceroute parser to more gracefully handle missing header row
- Update traceroute parser to handle annotations
- Update traceroute parser to only return successful probes

- Add route -6 tests

- Add ping and ping6 command parser tested on linux, macos, and freebsd
- Add traceroute and traceroute6 command parser tested on linux, macos, and freebsd
- Add tracepath command parser tested on linux
- Update ini parser to support files only containing key/value pairs
- Update uname parser exception with a hint to use "uname -a"
- Update route parser to support IPv6 tables

- Fix tests when using older version of pygments library

- Add sysctl command parser tested on linux, macOS, and freebsd
- Update the cli code to allow older versions of the pygments library (2.3.0) for debian packaging
- Code cleanup on the cli
- Add tests for the cli
- Vendorize cgitb as tracebackplus for verbose debug messages