add support for different chip detection + quad rotary demo

[ladyada]

@BlitzCityDIY will need linting n stuffs but is tested on a feather m4

[BlitzCityDIY]

@ladyada thanks! i ran pylint for the example but i wanted to check on an error in seesaw.py in the analog_read and analog_write functions:

seesaw.py:268:27: E0602: Undefined variable '_ATTINY8X7_HW_ID_CODE' (undefined-variable)
seesaw.py:364:27: E0602: Undefined variable '_ATTINY8X7_HW_ID_CODE' (undefined-variable)

i wasn't sure if the variable was maybe supposed to be _ATTINY807_HW_ID_CODE or _ATTINY817_HW_ID_CODE?

[ladyada]

@BlitzCityDIY ok i think if ixed that error, only the samd09 has weird offsets. now we just use the native pin names

[caternuson]

@ladyada OK, now it's just black (like clangformat, just run it and let it do what it wants) and pylint (fix or shush, etc).

[ladyada]

@BlitzCityDIY can you do the 🧹 - im getting roped into show stuff :)

[ladyada]

thanks all :)