Add option in gcovr_xml to use json format for mergeable report #78
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Hi,
gcovr can merge coverage report only if source report is json format.
So I add the ability to this helper to generate json report with gcovr.
To avoid copying all source code of setup_target_for_coverage_gcovr_xml and change output format, I add an option to this function to use json rather than xml.
I think it would have been better to create a function named setup_target_for_coverage_gcovr and add options to set output report format, default to xml, but doing this will break current API.