ctest: Add support for generating xUnit/JUnit XML output

Being able to generate JUnit XML output from CTest would be convenient for integration with CI tools (e.g. GitLab CI). The XML output produced by the current ctest -T Test option is not compatible.

Something like:

ctest --output-xunit test_results.xml

After updating, send a note to the Appveyor team suggesting that they update their CTest/JUnit documentation

Edited Mar 24, 2020 by Taylor Braun-Jones

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