* big refactor of the 'display' object. Now defined in variants/*/target modules.

variants/heltec_tracker/target.h

@@ -8,6 +8,9 @@
 #include <helpers/AutoDiscoverRTCClock.h>
 #include <helpers/SensorManager.h>
 #include <helpers/sensors/LocationProvider.h>
+#ifdef DISPLAY_CLASS
+  #include <helpers/ui/ST7735Display.h>
+#endif
 
 class HWTSensorManager : public SensorManager {
   bool gps_active = false;
@@ -31,6 +34,10 @@ extern WRAPPER_CLASS radio_driver;
 extern AutoDiscoverRTCClock rtc_clock;
 extern HWTSensorManager sensors;
 
+#ifdef DISPLAY_CLASS
+  extern DISPLAY_CLASS display;
+#endif
+
 bool radio_init();
 uint32_t radio_get_rng_seed();
 void radio_set_params(float freq, float bw, uint8_t sf, uint8_t cr);