Improve exception safety with smart pointers

Would you like to [wrap any pointers](https://github.com/umnsec/cheq/blob/59b694b7c6efcda8b667f8843ad37c465f09641b/analyzer/src/lib/Analyzer.cc#L134 "Update candidate: main()") with the class template “[std::unique_ptr](https://en.wikipedia.org/wiki/Smart_pointer#unique_ptr "Description for the usage of smart pointers")”?