platform: fix crash, move some code from h to cpp

src/Platform.cpp

@@ -74,6 +74,9 @@ Platform::freeRam()
 #ifdef BOARD_ESP8266
   return ESP.getFreeHeap();
 #endif
+#ifdef BOARD_ESP32
+  return ESP.getFreeHeap();
+#endif
 }
 
 void
@@ -206,6 +209,28 @@ Platform::deviceID()
     return s_deviceID;
 }
 
+void
+Platform::addLEDs(CRGB* leds, unsigned int ledCount) {
+  FastLED.addLeds<WS2812B, RENDERBUG_LED_PIN, RENDERBUG_LED_PACKING>(leds, ledCount);
+}
+
+const String
+Platform::model()
+{
+  static String modelName = String("Renderbug " ) + Platform::name();
+  return modelName;
+}
+
+void
+Platform::restart() {
+#ifdef BOARD_ESP8266
+    ESP.wdtDisable();
+    ESP.restart();
+#elif defined(BOARD_ESP32)
+    ESP.restart();
+#endif
+}
+
 BootOptions
 Platform::bootopts;