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Add no-server option

Add commandline option no-server to start up argo without any HTTP or ZeroMQ
services running. Allows more than one instance of argo to run at a time.
Flesh out CAN-USB support

Added functions for better CAN-USB support
Add Signal K field in PGN array
Update string handling

Makes a distinction between fixed length strings and variable length strings
which may be either null terminated or terminated with 0xFF.