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/Telemetry/DeviceTelemetry.cpp

@@ -12,7 +12,7 @@
 
 int32_t DeviceTelemetryModule::runOnce()
 {
-#ifndef PORTDUINO
+#ifndef ARCH_PORTDUINO
     if (firstTime) {
         // This is the first time the OSThread library has called this function, so do some setup
         firstTime = 0;