WebUI - First Release (#1586)

* WebUI - First Release

* Lint / Build Issues

* Add WebUI as a default module

* Fix ESP8266 builds

main/config_BT.h

@@ -34,7 +34,7 @@ extern void launchBTDiscovery(bool overrideDiscovery);
 extern void stopProcessing();
 extern void startProcessing();
 extern void lowPowerESP32();
-extern void stateBTMeasures(bool);
+extern String stateBTMeasures(bool);
 
 #ifdef ESP32
 extern int btQueueBlocked;