refactor bounding box indices for flatbuffer point clouds

[jarkenau]

Refactor adding of the bounding box indices. The indies are computed during write of the x,y,z point in writePoints(...) of writePointClouds(...). But since the CoreFb conversion needs to happen first to get the dataUUID of the point cloud, we can only add the bounding box as below. Usually the bounding Box should be set in the `CoreFb conversion as the other indices.

boost::uuids::uuid CoreFbPointCloud::addData(const seerep::fb::PointCloud2& pc)
{
  std::vector<float> boundingBox;

  seerep_core_msgs::DatasetIndexable dataForIndices = CoreFbConversion::fromFb(pc);

  auto hdf5io = CoreFbGeneral::getHdf5(dataForIndices.header.uuidProject, m_seerepCore, m_hdf5IoMap);
  hdf5io->writePointCloud2(boost::lexical_cast<std::string>(dataForIndices.header.uuidData), pc, boundingBox);

  dataForIndices.boundingbox.min_corner().set<0>(boundingBox[0]);
  dataForIndices.boundingbox.min_corner().set<1>(boundingBox[1]);
  dataForIndices.boundingbox.min_corner().set<2>(boundingBox[2]);
  dataForIndices.boundingbox.max_corner().set<0>(boundingBox[3]);
  dataForIndices.boundingbox.max_corner().set<1>(boundingBox[4]);
  dataForIndices.boundingbox.max_corner().set<2>(boundingBox[5]);

  m_seerepCore->addDataset(dataForIndices);

  return dataForIndices.header.uuidData;
}