Remove Arduino-specific code

# Story

I want to remove the Arduino-specific artifacts like Serial(), loop(), Setup()
So then I can compile the project without the Arduino compiler

# Tasks

 - [ ] Rewrite setup()
 - [ ] Rewrite loop()
 - [ ] Find C++ libraries for the equivalent of serial()

# Acceptance Criteria
- Revised code should pass a c linter
- Revised code should be compilable by the winAVR toolchain