Add support for ESP32S2

[fmuntean]

Can you please add support for ESP32S2 ?
Trying to compile this lib results in following error:
ESPeasySerial/ESPEasySerial_ESP32.cpp:103:46: error: 'Serial2' was not declared in this scope
case ESPEasySerialPort::serial2: return &Serial2;

[TD-er]

I've made some attempt about a month ago and managed to get it to compile....
But ESPEasy is immediately crashing with giving me no clue at all what may be wrong...
So given the extremely per-alpha stage of its support in Arduino I parked the idea a bit.

[fmuntean]

Looks like Espressif committed to master the support 10 days ago.

[TD-er]

Well right now I just have too much work at hand, but I will have a look at it in a few weeks.
Been working straight with only like 40 minutes break for dinner since 7 am this morning as I'm swomped in deadlines....

[fmuntean]

ok. I will open an issue on the main ESPEASY repository as would be nice to start development on these boards.
They are better than the esp8266 and easier to solder than the ESP32.
If you have any pointers on what you did to at least get it compiled would be great. I don't have much time myself but just got a set of these boards that I can test with. Prototype PCBs are still on order.