[x] generate SDF from triangle meshes [x] - tetmesh writeToList [x] - Half-Edge data structure [x] - top-down traversal [x] - bottom-top traversal [x] - Add unit-tests [x] - compute per vertex, half-edge and half-face normals [x] - add screenshots of examples and usage to README [] - extract tetrahedral mesh from SDF [] - add compressed MHD serializer [] - compute tetrahedral mesh [] - Python support