Added BACnetRecipient and BACnetAddressBinding codecs for EPICS application (#1163)

* Added BACnetRecipient and BACnetAddressBinding encoding, decoding, ASCII conversion, comparison, and copy functions.

*  Added library specific string manipulation utilities including strcmp, strncmp, stptok, and snprintf with offset functions.

* Added test/README about verification and validation testing.

test/README.md

@@ -0,0 +1,47 @@
+# BACnet Stack Verification and Validation Testing
+
+CMake and C99 are used for the verification and validation testing.
+
+## Testing in the Github workflow pipeline with Makefile
+
+The Makefile 'test' recipe is used for the CMake recipe used in the pipeline.
+
+The 'retest' can be used to re-build the test.
+
+Changing to the test/build folder and running 'make test' can show
+more details about a failing build or failing test. Running the actual
+test by running ./test/build/bacnet/.../test_xyz has more detailed
+results of running the test.
+
+## Testing with VS Code with CMake extension and C/C++ build tools
+
+* Open the test/ folder as a workspace.
+* The folder structure follows the src/bacnet folder structure.
+* Configure the CMake extension to use the C/C++ build tools kit.
+* Configure the CMake extension to use the Debug build type.
+* Build each or 'all' project using the CMake extension.
+* Each unit or verification test can be build individually.
+* The LCOV Cmake recipe will create Line-of-Code Coverage that
+  can be viewed in a browser starting at test/build/lcoverage/index.html
+* The CTest extension can also be used to run the tests.
+
+## Validation and Unit testing with ctest or ztest
+
+* The ctest suite is used from cmake managing the tests. Add new test
+  files following the src/bacnet folder structure into the CMakeLists.txt
+  file.  Copy and existing test folder at the same folder depth to start.
+* The ztest framework (from Zephyr) has been ported to use in the tests
+  and includes the fff mocking macros. The zassert_x() macros include a
+  formatted print as the last argument so that print style debug can be
+  used to show values that fail which aids in writing a test.
+* Tests can also be written without the zassert_x() macros by including
+  assert.h and using the assert() macro.
+
+## Use pre-commit tools for changes and additions
+
+* This library uses 'pre-commit' tools to format the files.
+* Run pre-commit after staging a file and before committing
+  to avoid pipeline build failures.
+* If a file fails pre-commit checking, the file will be re-formated
+  correctly by the pre-commit tool. Add the fixed file to the staged
+  files and run pre-commit again.