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Catch2 produces tests names with spaces by default when using type-parametric macros like `TEMPLATE_TEST_CASE` and `TEMPLATE_PRODUCT_TEST_CASE`. For some test-runners that are incompatible with spaces in test names, this presents a significant problem: It's possible to define a test that's impossible to run. This adds a `CATCH_CONFIG_NAME_SEPARATOR` configuration value that can be used to override the separator string used during test naming.