obj read/write, working on templates

Readme.md

src/polymesh/Mesh.hh

src/polymesh/algorithms.hh

src/polymesh/algorithms/operations.hh

src/polymesh/algorithms/properties.hh

src/polymesh/attribute_base.hh

src/polymesh/attribute_collection.hh

src/polymesh/attributes.hh

src/polymesh/cursors.hh

src/polymesh/fields.hh

src/polymesh/formats/obj.cc

src/polymesh/formats/obj.hh

src/polymesh/obj_writer.cc

src/polymesh/ranges.hh

src/polymesh/tmp.hh