GPIO branchless PWM flicker (#157)

* one GPIO library to rule them all

* GPIO example makefile transfer

* GPIO README.md video upload

* Update README.md

* Update README.md

* GPIO library path recitified

* GPIO pretty paths please

* platformio.ini removed GPIO_analogRead test

* GPIO removed implementation block (unused)

* restoring blink.bin #1

* restoring blink.bin #2

* GPIO_branchless added branching digitalWrite (sometimes necessary)

* GPIO fixed PWM fade flicker

---------

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