Function printHeaderString

extras/catch_amalgamated.cpp:11906–11915

if string has a : in first line will set indent to follow it on subsequent lines

        // if string has a : in first line will set indent to follow it on
        // subsequent lines
        void printHeaderString(std::ostream& os, std::string const& _string, std::size_t indent = 0) {
            std::size_t i = _string.find(": ");
            if (i != std::string::npos)
                i += 2;
            else
                i = 0;
            os << TextFlow::Column(_string)
                  .indent(indent + i)
                  .initialIndent(indent) << '\n';
        }

        std::string escape(StringRef str) {
            std::string escaped = static_cast<std::string>(str);