v2.3.0 tracking issue

[jbeyerstedt]

Features for v2.3.0:

• feat(pcap): Make all "remove" functions public and add "extract" functions (to get the header binary data) #65
• chore: Cleanup imports #68
• decide on feat(lib): Export geonetworking crate as gn #69
• Update to geonetworking v0.3.0: chore(deps): Update geonetworking #70