No SoftwareSerial allowed when using a ESP32

[ztoundas]

I am trying to use the ESPSoftwareSerial library alongside this, but I get errors that .listen() is undefined.

A quick look at the .h and .cpp library files make it clear that HARDWARE_SERIAL is forced for ESP32 boards (and some others).

Adding a provision for overriding this behavior, like when we are using the ESPSoftwereSerial library, would be great. I ended up just removing the references to that board specifically in the .h and .cpp files, but i barely know what I am doing..