Feature Request: 1-ring of the center vertex, i.e. iterator for neighbors of each vertex

[electrocnic]

To be able to iterate over the neighbors of each vertex in the correct order (1-ring of the center) would be nice.

Currently I have to figure out how to parse the neighbors on my own in the correct order. It is not enough to just store each neighbor per vertex in a list, because the order of the iteration is important for calculations.

For example, OpenMesh in C++ provides VertexVertexIter: https://www.graphics.rwth-aachen.de/media/openflipper_static/Documentation/OpenFlipper-1.1/mesh_iterators.html