gis/whitebox-tools: Added (geospatial data analysis platform).

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

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+WhiteboxTools is an advanced geospatial data analysis platform developed by
+Prof. John Lindsay at the University of Guelph's Geomorphometry and
+Hydrogeomatics Research Group. WhiteboxTools can be used to perform common
+geographical information systems (GIS) analysis operations, such as
+cost-distance analysis, distance buffering, and raster reclassification. Remote
+sensing and image processing tasks include image enhancement (e.g. panchromatic
+sharpening, contrast adjustments), image mosaicing, numerous filtering
+operations, simple classification (k-means), and common image transformations.
+WhiteboxTools also contains advanced tooling for spatial hydrological analysis
+(e.g. flow-accumulation, watershed delineation, stream network analysis, sink
+removal), terrain analysis (e.g. common terrain indices such as slope,
+curvatures, wetness index, hillshading; hypsometric analysis; multi-scale
+topographic position analysis), and LiDAR data processing. LiDAR point clouds
+can be interrogated (LidarInfo, LidarHistogram), segmented, tiled and joined,
+analyized for outliers, interpolated to rasters (DEMs, intensity images), and
+ground-points can be classified or filtered. WhiteboxTools is not a
+cartographic or spatial data visualization package; instead it is meant to
+serve as an analytical backend for other data visualization software, mainly
+GIS.