add vcglib

vcglib/docs/Doxygen/namespaces.dox

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+␍/**␍Main namespace.␍It contain all the other namespaces and  ␍*/␍namespace vcg {}␍␍/**␍Everything about triangular meshes lie in this namespace␍*/␍namespace vcg::tri {}␍␍/**␍Everything about tetrahedral meshes lie in this namespace␍*/␍namespace vcg::tetra {}␍␍/**␍Global algorithms and classes working on generic faces are defined in this namespace.␍Typical example are the topological surgery functions (like vcg::face::Detach and vcg::face::IsBorder) and the class vcg::face::Pos ␍for defining \e positions over a mesh. Note that for sake of brevity the main face class is defined outside this namespace.␍*/␍namespace vcg::face {}␍␍/**␍Wrapper for symbols and structs defind in the old ply library␍*/␍namespace vcg::ply {} ␍␍/**␍For all the functions and classes used to read and write meshes␍*/␍namespace vcg::tri::io {}␍␍/**␍For all the functions and classes used to read and write Tetrahedral Meshes␍*/␍namespace vcg::tetra::io {}␍␍/**␍For all the generic math functions and classes.␍*/␍namespace vcg::math {}␍