B4R Library rESP8266Tone

Now ESP8266Tone is implemented also as a b4xlib. Check the first post of the following thread:

Play tone in ESP8266.

Yesterday I tried to play a tone to a passive buzzer using the rTone library in a WeMos D1 Mini v3.0.0 module.. It was a complete fail because there is an inconsistency between Esp8266 boards and rTone library and B4R/Arduino reports that interrupt.h file is missing. So I figured a way around...

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