Change cmake test file so it is possible to add separate unit test executables #934
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Describe your changes
Until now libocpp always used one big test executable. All tests were linked against the whole libocpp library. That is not always necessary and desirable. With some cmake changes, it is possible to add separate test executables.
I changed the utils_tests so it is created as a separate target instead of inside the default libocpp_unit_tests target, just to make it work and to have an example of how you can do this.
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