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

config_mqttDiscovery.h

@@ -25,8 +25,6 @@
 
 */
 #define discovery_Topic "homeassistant"
-#define omgStatus //uncomment to create OMG status sensor
-#define discBme280 //uncomment to enable bme280 sensors
 
 #define DEVICENAME "OpenMQTTGateway " Gateway_Name
-#define DEVICEMANUFACTURER "AnimaVitis"
+#define DEVICEMANUFACTURER "OMG_community"