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_BT.h

@@ -32,6 +32,7 @@
 #define ZgatewayBT_v6xx // comment if you don't have a firmware version of HM10/11 >= v601
 #define delimiter "4f4b2b444953413a"
 #define delimiter_length 16
+#define pubBLEServiceData true // comment if you don't want to publish service data (in case you are having too heavy service data) https://github.com/1technophile/OpenMQTTGateway/issues/318#issuecomment-446064707
 
 /*-------------------HOME ASSISTANT ROOM PRESENCE ----------------------*/
 // if not commented Home presence integration with HOME ASSISTANT is activated