* new ui/DisplayDriver classes (just SSD1306Display impl for now)

* companion radio: now with optional UITask (enabled by DISPLAY_CLASS config in target/env)

src/helpers/HeltecV3Board.h

@@ -17,6 +17,7 @@
 #define  PIN_ADC_CTRL_ACTIVE    LOW
 #define  PIN_ADC_CTRL_INACTIVE  HIGH
 #define  PIN_LED_BUILTIN 35
+#define  PIN_VEXT_EN     36
 
 #include "ESP32Board.h"
 
@@ -28,6 +29,7 @@ public:
     ESP32Board::begin();
 
     pinMode(PIN_ADC_CTRL, OUTPUT);
+    //pinMode(PIN_VEXT_EN, OUTPUT);
 
     esp_reset_reason_t reason = esp_reset_reason();
     if (reason == ESP_RST_DEEPSLEEP) {