fork canbus library and implement as git submodule

[rickyelopez]

I used this library to implement the MCP2515. I had to modify it slightly to get it to work for our use case. Thus, it hasn't been updated from source in literally years. It would be nice to rebase to the new code and validate that everything still works. If the modification that I originally made is still necessary, the repo should be forked to our org and modified. Either way it should be re-implemented using a git submodule so that we can keep it up to date. It would also be nice to see whether we can just do away with this library and use the Seeed library (here) instead

• independently (i.e. not using the steering wheel, lest we seriously break something) validate whether the un-modified seeed codebase works for can communication between the motec and stm32/esp32.
  • if it doesn't work, make it work
  • re-implement the modification I had originally made (talk to @rickyelopez about this if necessary)
• Fork the the adafruit repo into our organization and modify as necessary
• Re-implement into this repo as a git submodule