RAM Refactoring: Frequency Measurement of Atoms

[b-scholz]

In RamNestedOperation nodes, we store a profile text for measuring frequencies in the interpreter/synthesiser in case profiling is switched on.

/** @brief Get profile text */
    const std::string& getProfileText() const {
        return profileText;
    }

This violates the PODs idea, i.e., a minimal passive data structure for representing RAM instructions.

We can refactor the code by introducing a new Profiling RAM Operation that stores the profiling information.