move saturation_cast out of PointBuffer into Utils::
move saturation_cast out of PointBuffer into Utils::

verma/PDAL,verma/PDAL,verma/PDAL,Sciumo/PDAL,Sciumo/PDAL,verma/PDAL,verma/PDAL,DougFirErickson/PDAL,mpgerlek/PDAL-old,mtCarto/PDAL,mpgerlek/PDAL-old,Sciumo/PDAL,jwomeara/PDAL,boundlessgeo/PDAL,verma/PDAL,radiantbluetechnologies/PDAL,DougFirErickson/PDAL,mtCarto/PDAL,radiantbluetechnologies/PDAL,DougFirErickson/PDAL,boundlessgeo/PDAL,verma/PDAL,jwomeara/PDAL,radiantbluetechnologies/PDAL,boundlessgeo/PDAL,jwomeara/PDAL,mtCarto/PDAL,lucadelu/PDAL,mpgerlek/PDAL-old,lucadelu/PDAL,lucadelu/PDAL,mpgerlek/PDAL-old,lucadelu/PDAL,radiantbluetechnologies/PDAL,mtCarto/PDAL,Sciumo/PDAL,boundlessgeo/PDAL,jwomeara/PDAL,DougFirErickson/PDAL