Bugfix/deprecate decode tag number and value (#481)

* added or updated secure the BACnet primitive value decoders - the core codecs - named bacnet_x_decode(), bacnet_x_application_decode() and bacnet_x_context_decode where x is one of the 13 BACnet primitive value names.  The updated API includes an APDU size to prevent over-reading of an APDU buffer while decoding.  Improved or added unit test code coverage for the BACnet primitive value decoders.

* marked the insecure decoding API as 'deprecated' which is defined in src/bacnet/basic/sys/platform.h and can be disabled during a build. 

* added secure decoders for BACnetTimeValue, BACnetHostNPort, BACnetTimeStamp, BACnetAddress, and Weekly_Schedule and improved unit test code coverage.

* improved test code coverage for BACnet objects and properties.

* secured AtomicReadFile and AtomicWriteFile service decoders and improved unit test code coverage.

* secured BACnet Error service decoder and improved unit test code coverage.

---------

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

src/bacnet/basic/object/access_point.c

@@ -291,6 +291,10 @@ int Access_Point_Read_Property(BACNET_READ_PROPERTY_DATA *rpdata)
                 }
             }
             break;
+        case PROP_PRIORITY_FOR_WRITING:
+            apdu_len = encode_application_unsigned(
+                &apdu[0], ap_descr[object_index].priority_for_writing);
+            break;
         default:
             rpdata->error_class = ERROR_CLASS_PROPERTY;
             rpdata->error_code = ERROR_CODE_UNKNOWN_PROPERTY;