Bugfix/issues 1082 AddListElement and RemoveListElement and Notification Class object (#1083)

* Fixed AddListElement and RemoveListElement which were checking the wrong return value from Device object.

* Fixed decoding of ListElement Tag 0: Object ID instance.

* Fixed Notification_Class_Add_List_Element() and Notification_Class_Remove_List_Element() element counter index, and empty slot detection.

* Added bacnet_recipient_device_set() and bacnet_recipient_address_set() API

* Added unit test coverage for Notification Class object.

src/bacnet/basic/object/nc.h

@@ -23,7 +23,9 @@ extern "C" {
 #define NC_RESCAN_RECIPIENTS_SECS 60
 
 /* max "length" of recipient_list */
+#ifndef NC_MAX_RECIPIENTS
 #define NC_MAX_RECIPIENTS 10
+#endif
 
 #if defined(INTRINSIC_REPORTING)