Feature/junit report

[mradugin]

Implemention of junit report generation in command line mode

[drowaudio]

Thanks for the PR!
I've had a look but I'm wondering if a slightly easier approach would be to do it the same way I did for Tracktion Engine: https://github.com/Tracktion/tracktion_engine/blob/f57e110f7982f6611b4f5ec41c1a11880849abcf/examples/TestRunner.h#L102

Would this give the same results as what you've done?