New connectivity toolkit for Mindstorms/Spike Prime hub

[Steve Robbins]

For those looking to either use a custom application to monitor the robot state as it runs; or those looking to program the hub using a linux machine: I have just put up a new github repository of interest: https://github.com/smr99/lego-hub-tk

I started with the spike tools (https://github.com/nutki/spike-tools, via https://github.com/sanjayseshan/spikeprime-tools) and then wrote a new communication layer that can use both USB and Bluetooth, with failover -- i.e. if you unplug from USB, it will automatically switch to Bluetooth.  I added in a mechanism to continuously monitor the hub's sensors and devices, and the console output from a running program.  It is a work-in-progress -- not all the hub messages are understood -- but useful enough.  Let me know what you think!