Added PLY writing tools RWPly_CafWriter and RWPly_PlyWriterContext.
Added tool BRepLib_PointCloudShape generating point cloud from shape in two ways:
- random points on surface with specified density;
- points from triangulation nodes.
StdPrs_ToolTriangulatedShape::ComputeNormals() has been moved to
BRepLib_ToolTriangulatedShape for reusing outside of AIS.
Command vpointcloud has been extended to use new generation tool.
Command writeply has been added to write triangulation or point set into PLY format.
