`Submap3D` now also stores a pointer to `IntensityHybridGrid`.
Adapted `RangeDataInserter3D` to also insert intensities.
Signed-off-by: Wolfgang Hess <whess@lyft.com>
This is to make it possible to use the proto definitions
from Python where the directory structure otherwise
prevents them from being imported in the usual way.
Signed-off-by: Wolfgang Hess <whess@lyft.com>