New version with V3.1

My idea would be to

1. remove old branches (ESP32 and ESP32-V3.0). Both are some commits ahead since may or june. From my best knowledge, we don't need these commts. I've done my testing and converting based on Espruino Master and ESP-IDF V3.1 release.
   
2. create a new branch ESP32-V3.1
   
3. pull up my changes to ESP-V3.1
   
4. see, if you can build. If there are problems we have to fix
   
5. once its running, merge into master
   
   

Anyway, I'm absolutely open for any other route.