Laser scan RGB support

To import a LiDAR laser scan file with the format x y z r g b use cmdop lidartosd

INFO: Usage is:  lidartosd
                [ -in <file> ]
                [ -out <outputFileName> ]
                [ -vars <variableFormatString> (i.e. x y z r g b, x y z color)> ]

This utility converts LIDAR data into an SD point object.  Expected format is ASCII containing x, y and z values as well as a color specified as r, g, b or a single 32-bit color. If your data is structured as position and separate color channels, use a format string of "x y z r g b".  If you have a 32-bit color, simply use a format string of "x y z color".