Add some Xtensa targets. ESP32, ESP8266 and a generic Xtensa target.

Merge pull request #39 from MabezDev/master-update-27-07-2020

Master update 27 07 2020

1.33.0 release

1.32.0 release

1.31.1 release

1.31.0 release

1.30.1 release

1.30.0 release

1.29.2 release

1.29.1 release