Improve exception safety with smart pointers

Would you like to [wrap any pointer data members](https://github.com/szechyjs/dsd/blob/290a2204ba2a579bb32a1fb95d4c2a4683e8f770/include/ReedSolomon.hpp#L132 "Update candidate: ReedSolomon_63 class") with the class template &ldquo;[std::unique_ptr](https://en.wikipedia.org/wiki/Smart_pointer#unique_ptr "Description for the usage of smart pointers")&rdquo;?