Public release of new ESP32 code

On the platforms besides the ESP32 and ESP8266, that is, Arduino AVR, Windows, or Linux, basically only a task list of all active tasks was added, which simplifies periodic scheduling from loop(). See the examples.

On Espressif ESP8266, the scheduler expects the changes from a pull request, that so far has not been merged yet in ESP8266 Arduino master.

On Espressif ESP32, this release now bases its task creation and scheduling on FreeRTOS. This relies on a, at the time of writing this, unmerged pull request, therefore in order to deploy it to any ESP32, you need to use Arduino-ESP32, plus apply this PR.