This allows us represent all shift registers as memory variables where
we want to update them independently from rendering. Want to allow us to write
as much and as efficiently as possible to write data to arduino memory,
but only write to shift registers when state dictates it.
Currently use state variables to store data and check for changes that
will trigger display/shift register refresh.
- Created helper function for setting each LED
- Helper functions take bank of 8 bit register to hold state in main
file, and use helper functions to manipulate state variables using
pointers.
