avr: pin change interrupt #3841
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This adds support for pin change interrupts on AVR, atmega328p chip used by Arduino UNO and Nano boards.
Fixes #3145
This PR is based on work done by @mrbell321 in #3139 (that PR apparently stalled).
Implemented in addition to original PR:
nil)PinRisingandPinFallingVerified on Arduino UNO by shorting D2 and GND pins: LED changes on breaking the contact (as expected).