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/http/WebServer.cpp

@@ -11,7 +11,7 @@
 #include <WebServer.h>
 #include <WiFi.h>
 
-#ifndef NO_ESP32
+#ifdef ARCH_ESP32
 #include "esp_task_wdt.h"
 #endif
 
@@ -152,7 +152,7 @@ void createSSLCert()
 
                     yield();
                     esp_task_wdt_reset();
-#ifndef NO_SCREEN
+#if HAS_SCREEN
                     if (millis() / 1000 >= 3) {
                         screen->setSSLFrames();
                     }