Feature/writepropertymultiple error handler (#289)

* Added extended BACnet Error PDU handling for WPM

* Added BACnetObjectPropertyReference to bacapp module.

* Added unit testing for BACnetObjectPropertyReference

Co-authored-by: Steve Karg <skarg@users.sourceforge.net>

test/bacnet/npdu/CMakeLists.txt

@@ -36,6 +36,7 @@ add_executable(${PROJECT_NAME}
     # Support files and stubs (pathname alphabetical)
 	${SRC_DIR}/bacnet/bacaddr.c
 	${SRC_DIR}/bacnet/bacdcode.c
+	${SRC_DIR}/bacnet/bacerror.c
 	${SRC_DIR}/bacnet/bacint.c
 	${SRC_DIR}/bacnet/bacreal.c
 	${SRC_DIR}/bacnet/bacstr.c