Secured BACnetTimeValue codec, and improved unit test coverage. (#648)

* Secured BACnetTimeValue codec, and improved unit test coverage.

src/bacnet/special_event.c

@@ -4,9 +4,7 @@
  * @author Ondřej Hruška <ondra@ondrovo.com>
  * @author Steve Karg <skarg@users.sourceforge.net>
  * @date May 2022
- * @section LICENSE
- *
- * SPDX-License-Identifier: GPL-2.0-or-later WITH GCC-exception-2.0
+ * @copyright SPDX-License-Identifier: GPL-2.0-or-later WITH GCC-exception-2.0
  */
 
 #include <stdint.h>