Fix lighting output commands for warn-off and warn-relinquish (#1212)

* Fixed lighting output object lighting-commands for warn-off and warn-relinquish when blink-warn notification shall not occur.

* Fixed timer object task to initiate a write-request at expiration.

* Added channel and timer object write-property observers in blinkt app to monitor internal writes.

* Added vacancy timer command line argument in blinkt app for testing initial timer object vacancy time for lights channel.

src/bacnet/basic/object/timer.c

@@ -2190,6 +2190,10 @@ void Timer_Task(uint32_t object_instance, uint16_t milliseconds)
                     pObject->Timer_State = TIMER_STATE_EXPIRED;
                     pObject->Last_State_Change =
                         TIMER_TRANSITION_RUNNING_TO_EXPIRED;
+                    datetime_local(
+                        &pObject->Update_Time.date, &pObject->Update_Time.time,
+                        NULL, NULL);
+                    Timer_Write_Request_Initiate(object_instance, pObject);
                 }
                 break;
             case TIMER_STATE_EXPIRED: