Added Who-Is-Router process for Notification Class recipient unknown router addresses. (#1243)

* Added Who-Is-Router-To-Network process in basic Notification Class when recipient address is missing the router MAC address.

* Added buffer_length parameter to octet string buffer decode functions

* Fixed BACnet address handling for I-Am-Router address updating the recipient list address for the next hop router.

* Changed VMAC encoding and decoding to use octet string buffer API to reduce stack RAM.

test/bacnet/basic/object/nc/CMakeLists.txt

@@ -72,6 +72,8 @@ add_executable(${PROJECT_NAME}
     # Test and test library files
     ./stubs.c
     ./src/main.c
+    ${TST_DIR}/bacnet/basic/object/test/datetime_local.c
+    ${TST_DIR}/bacnet/basic/object/test/device_mock.c
     ${ZTST_DIR}/ztest_mock.c
     ${ZTST_DIR}/ztest.c
     )