Deprecated SupervoxelClustering getter functions for rgb clouds. Now use the label field handlers from #849 , deprecated functions return empty cloud to deprecated functions to avoid warnings

Changed labeled color handler to use modulo max color instead of using random colors
Merge pull request #941 from jpapon/supervoxel_coloring_update

Supervoxel coloring update
Add Ensenso support in CMake files
Add Ensenso grabber example
Add EnsensoGrabber class
Add Ensenso simple viewer
Add Ensenso documentation & tutorial