Mqtt discovery for ha (#323)

* MQTT discovery factoring

* add DHT discovery

* BME topic macro change

* add sensors to ha discovery

* correct a comment typo #327

* let the possibility at buildtime to don't publish service data

* reduce string usage

* change MQTT ONOFF actuator to ON OFF commands instead of true false

* add ZactuatorONOFF discovery

* add simple publishing for GPIO input

* Add RF switch and gateway discovery

ZsensorBME280.ino

@@ -173,7 +173,7 @@ void MeasureTempHumAndPressure()
       }else{
         trc(F("Same Altitude Feet don't send it"));
       }
-      if(BME280data.size()>0) pub(BME,BME280data);
+      if(BME280data.size()>0) pub(BMETOPIC,BME280data);
     }
     persisted_bme_tempc = BmeTempC;
     persisted_bme_tempf = BmeTempF;