Add multiple configuration options for a minimized build (GPS,WiFi,BT,MQTT,Screen). (#3469)

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>

src/main.h

@@ -54,6 +54,7 @@ extern int TCPPort; // set by Portduino
 
 // Global Screen singleton.
 extern graphics::Screen *screen;
+
 // extern Observable<meshtastic::PowerStatus> newPowerStatus; //TODO: move this to main-esp32.cpp somehow or a helper class
 
 // extern meshtastic::PowerStatus *powerStatus;