Kevin Roscom

This PR resolves #41 - Userland based on Termux, non-root equivalent being worked on by @lime_bird on the Discord - Panda builds and flashes successfully - boardd compiler directives added...

goal is to try and make Flowpilot boot in the [RetrOS userland](https://github.com/RetroPilot/retros-userspace-builder), so we can eventually start leveraging the hardware more and get the codebase closer to openpilot. Flowpilot reqs...