minimal implementation: if there is a configured INA219 sensor for battery monitoring we can take the current flow across the shunt resistor to know if we are charging the battery - negative milliamps indicate charging
* WIP
* Continued wip
* We got em
* Voltage sensor base class
* INA voltage
* Log it
* Stacie's mom has got it going on
* Move declaration up
* Last one
* Sneaky little bugger
* Macro guard to avoid calling methods