message: Removed unused optional header from RenderingParameters
diff: #include "glm/gtc/matrix_transform.hpp"
  #include "glm/gtc/quaternion.hpp"
  -#include "eos/fitting/detail/optional_cerealisation.hpp"
  #include "eos/fitting/detail/glm_cerealisation.hpp"
  #include "cereal/cereal.hpp"
  #include "cereal/archives/json.hpp"
  #include "Eigen/Core"
  -#include "boost/optional.hpp"
  -
  #include <string>
  #include <fstream>
  #include <stdexcept>
  