0029325: Modeling Algorithms - add tool BRepLib_PointCloudShape for generation point cloud for specified shape

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.

src/BRepLib/FILES

@@ -30,8 +30,12 @@ BRepLib_MakeVertex.hxx
 BRepLib_MakeWire.cxx
 BRepLib_MakeWire.hxx
 BRepLib_MakeWire_1.cxx
+BRepLib_PointCloudShape.hxx
+BRepLib_PointCloudShape.cxx
 BRepLib_ShapeModification.hxx
 BRepLib_ShellError.hxx
+BRepLib_ToolTriangulatedShape.hxx
+BRepLib_ToolTriangulatedShape.cxx
 BRepLib_ValidateEdge.cxx
 BRepLib_ValidateEdge.hxx
 BRepLib_WireError.hxx