Consistent API for sensor and processor constructors

We currently have

    SensorMySensor      (const Eigen::VectorXs&       _extrinsics,
                         const IntrinsicsMySensorPtr& _intrinsics);

so, const XxxPtr&, but

    ProcessorMyAlgorithm(ProcessorParamsMyAlgorithmPtr _processor_params);

so XxxPtr.

Which one should prevail? This difference makes no sense.