Add triggering of actuator on/off state by button press.

This will enable using button on the gateway to switch any controlled attached actuators/relays when pressed.

Adds the following macros:
- ACTUATOR_ON; 0 or 1, set to the output level of the gpio pin to turn the actuator on.
- ACTUATOR_ONOFF_DEFAULT; ACTUATOR_ON or !ACTUATOR_ON, set to the state desired on reset.
- ACTUATOR_BUTTON_TRIGGER_LEVEL; 0 or 1, set to the sensing level which to detect a button press to change the actuator state.

main/ZactuatorONOFF.ino

@@ -76,4 +76,15 @@ void MQTTtoONOFF(char* topicOri, char* datacallback) {
 }
 #  endif
 
+void ActuatorButtonTrigger() {
+  uint8_t level = !digitalRead(ACTUATOR_ONOFF_GPIO);
+  char* level_string = "ON";
+  if (level != ACTUATOR_ON) {
+    level_string = "OFF";
+  }
+  Log.trace(F("Actuator triggered %s by button" CR), level_string);
+  digitalWrite(ACTUATOR_ONOFF_GPIO, level);
+  pub(subjectGTWONOFFtoMQTT, level_string);
+}
+
 #endif