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IO/Xdmf3: Handle Polyhedron cells in unstructured grids with mixed topology

This adds support for Polyhedron cells to Xdmf3 Elements of type Polyhedron (i.e. N face cells, where each face is a M edge polygon) are in the following format: [nCellFaces, nFace0Pts, id0_0, id0_1, ..., nFace1Pts, id1_0, id1_1, ..., ...]

Subsumes !1255 (closed).

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