Add support for modern AVRs like Attiny 0,1,2 series

[mgrosvenor]

No description provided.

[mgrosvenor]

Code liberally borrowed from https://github.com/SpenceKonde/OneWire/blob/master/util/OneWire_direct_gpio.h

With thanks to @SpenceKonde

[amarotica]

Orgua's commit is a great addition to the OneWireHub library. It seems to be working on an AVR16DD20 MCU which was not working before I utilized their update.

[Stopfbit]

Thank you for the changes. Tested on an ATTiny817, which has now been working without any problems for about 20 hours.

[mgrosvenor]

I wrote this patch because I wanted to use an attiny1616 which seems to also be working. Any of the 0/1/2 series should also work.

[imdbere]

Thanks so much, can confirm that it works for the Attiny412 as well.
Hope this will get merged at some point, for everyone using PlatformIO, this is how you can use it in the meantime:

lib_deps = https://github.com/mgrosvenor/OneWireHub.git#modern_avrs

[amarotica]

These changes have been tested on AVR DD series MCUs and are fully functional. @orgua when you get a chance, please merge with the main branch so these updates are readily available to others.