Function throwing_string_format

tests/string_formatter_test.cpp:12–17

// Same as @ref string_format, but does not swallow errors and throws them instead.
template<typename ...Args>
std::string throwing_string_format( const char *const format, Args &&...args )
{
    cata::string_formatter formatter( format );
    formatter.parse( std::forward<Args>( args )... );
    return formatter.get_output();
}

template<typename ...Args>
void importet_test( const int serial, const char *const expected, const char *const format,