ESP32 compile issues with fix

[zlewko]

I had trouble compiling for 3.3.0 for ESP32, I needed to make two changes to the library to get it to compile and work.

analogOutputFirmata.h Line 32:
#if ESP32
changed to
#ifdef ESP32

analogOutputFirmataEsp32.cpp Line 33:
internalReset();
changed to
this->internalReset();

[pgrawehr]

Thank you. That is a known issue and already fixed on master. I just didn't have time yet to complete the release. I'll try to do this soon.

[PizzaProgram]

I think if we fix the SERVO part, (see pending pull req. here)
Than we can normalise this part of the sample files too:

// Note that the SERVO module currently is not supported on ESP32. So either disable this or patch the library
#ifndef ESP32
// #define ENABLE_SERVO 
#endif