* Initial implementation of RGB driver via digitalWrite
* Moved constants to pins_arduino.h
* Changed pin definition + added example
* Wrapped BlinkRGB in #ifdef BOARD_HAS_NEOPIXEL
* Removed forgotten log from example
* Moved RGBLedWrite to new file esp32-hal-rgb-led and created pinMode in variatn.cpp
* Updated example - lowered single channel brightness to LED_BRIGHTNESS
* Changed function name from RGBLedWrite to neopixelWrite + code polishing
* Moved pinSetup portion related to RGB back to common file
* GPIO refactoring
GPIO now using ESP-IDF API on all chips.
LEDC interrupt fix removed - no longer needed.
Edited pins_arduino.h in variants according to changes in gpio.
* Edited analog channels functions
