make ON OFF actuator more flexible (#481)

* make ON OFF actuator more flexible

enable to choose the pin when sending the MQTT command

* add on off environment example

main/main.ino

@@ -579,9 +579,6 @@ void setup()
   #ifdef ZsensorTSL2561
     setupZsensorTSL2561();
   #endif
-  #ifdef ZactuatorONOFF
-    setupONOFF();
-  #endif
   #ifdef Zgateway2G
     setup2G();
   #endif