lay groundwork for a possible future architecture (#1571)

* lay groundwork for a possible future architecture

* switch from feature opt-out to feature opt-in

* lay groundwork for a possible future architecture

* switch from feature opt-out to feature opt-in

* fix USE_RTC in variant.h for rak4631_epaper and t-echo

* ensure Screen.h is not included without configuration.h

Co-authored-by: Peter Lawrence <12226419+majbthrd@users.noreply.github.com>
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/modules/esp32/SerialModule.cpp

@@ -69,7 +69,7 @@ SerialModuleRadio::SerialModuleRadio() : SinglePortModule("SerialModuleRadio", P
 
 int32_t SerialModule::runOnce()
 {
-#ifndef NO_ESP32
+#ifdef ARCH_ESP32
 
     /*
         Uncomment the preferences below if you want to use the module
@@ -209,7 +209,7 @@ void SerialModuleRadio::sendPayload(NodeNum dest, bool wantReplies)
 
 ProcessMessage SerialModuleRadio::handleReceived(const MeshPacket &mp)
 {
-#ifndef NO_ESP32
+#ifdef ARCH_ESP32
 
     if (moduleConfig.serial.enabled) {