Improved calculations, changed switch detection, testing toggles, added TAGS

- PID and bang bang sweep through all samples we want and control PWM
- Switches perform correct tests based on values
- Switch 3 sets the initial input voltage to min or max
- Testing starts with rotary push, automatically sends when done
- Setpoint is calculated
- Tags {TODO, QUESTION, NOTES}: added throughout the code
- Untested
Merge branch 'master' of https://github.com/rhodeser/cockroach-sunset