Feature rich release for beta testing

Substantially feature complete digipeater firmware replacement for the PK-88 TNC.

New features include:

• APRS queries and sending ACK to all APRS messages sent to the digipeater
• Viscous digipeating for only packets missed by other digipeaters
• Improved logging to avoid packet loss due to high traffic
• Move some config settings to be "shadow" settings since no one should care about them
• Quality of life improvements in the CLI and telemetry systems