to keep platformio projects in sync with the examples folders, I added missing ones in alphabetical order.

* 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)

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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