Update Raspberry Pi Hardware detection
https://elinux.org/RPi_HardwareHistory documents the current board revisions for various Raspberry Pi models. Notably this has been updated since hwio Raspberry Pi driver was last updated. Update the library to handle all variations, and issue an "unsupported" message if not supported. This may require test boards for those not already tested, or volunteers to test with their boards.
These boards specifically need to be included: model 3, zero.
If you need any help with these I can test on both this models.I will try to do some tests now.
Add PI 3 Model B & B+
https://github.com/mrmorphic/hwio/pull/56
Switched to periph.io instead.