* Added characterstring change of value example
* Add COV to unit tests
* Add memcopy to object COV unit tests
Co-authored-by: Steve Karg <skarg@users.sourceforge.net>
* Leverage (older) embedded unit tests into external unit tests build upon copy of Zephyr's ztest library and CMake.
* Expand top-level CMake build to run external unit tests.
* Expand Zephyr module extension to run external unit tests via west or sanitycheck.
Co-authored-by: Gregory Shue <gregory.shue@legrand.us>