Add CppUTest, a C/C++ based unit xUnit test framework for unit testing
and for test-driving your code. It is written in C++ but is used in C
and C++ projects and frequently used in embedded systems but it works
for any C/C++ project.

CppUTest's core design principles are:

- Simple in design and simple in use.
- Portable to old and new platforms.
- Build with Test-driven Development in mind.
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(schmonz)