examples: add independant watchdog example

Add I2C slave library and example

Co-authored-by: recallmenot <edmund.raile@proton.me>

* Fix caching
* Create requirements.txt
* Fix PlatformIO build for Wiring examples, use cache properly
* Remove uneeded file
* Add slightly more into PlatformIO ini

Collection of udev niceties

These are being assigned to the plugdev group, but everything was always writeable.

This makes it so the mode is now 660 so the plugdev group is respected.

We shouldn't change the hidraw rules of every device here.

These don't work otherwise on my setup.

Revert "Add I2C slave library & example"

Add I2C slave library & example

Fix wiring and move it to extralibs.

Only perform norvc for boot section only.  Sometimes this can be "lea…

Input capture

Only perform norvc for boot section only.  Sometimes this can be "leaky." and flow outside of the boot function.

GPIO example fixes: fixed port A off-by-one, replaced multiplies with bitshifts, Padded GPIO enum def's

update gpio enum

update GPIO enum

added support for clangd #4