Add analog read/write like feature for direct pin support

[luc-github]

Analog write is not available in ESP32 but instead of use a external lib I plan to use the ledcWrite function
For esp8266 - I need to check

[luc-github]

requested here : #286

[luc-github]

done : 99b892c
new parameters :
ANALOG=NO ANALOG_RANGE=255 CLEARCHANNELS=NO
so by default if ANALOG=YES is not set, it is digital to keep backware compatibility
Default range is 255 which means 8 bits resolution, can be 1024 (10 bits) or other proper value, this value must be set at each call or default value is used
Default frequency use 1Mhz as I was not sure it would be useful to add a parameter for it
CLEARCHANNELS=YES is only for ESP32 to reset pin/channel assignment

For ESP8266 as only 1 ADC, any pin number will work for Analog reading, for ESP32 there are up to 16 pins because 16 channels
I did not tested heavily as I am travelling but feel free to feedback

[github-actions]

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