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/mesh/RadioLibInterface.h

@@ -41,7 +41,7 @@ class LockingModule : public Module
     {
     }
     
-#ifdef PORTDUINO
+#ifdef ARCH_PORTDUINO
     void SPItransfer(uint8_t cmd, uint8_t reg, uint8_t *dataOut, uint8_t *dataIn, uint8_t numBytes) override;
 #else
     void SPIbeginTransaction() override;