since enough bmesh operations can also take advantage of direct index lookups on verts/edges/faces. developers note: - EDBM_index_arrays_init/ensure/free -> BM_mesh_elem_table_ensure/init/free - EDBM_vert/edge/face_at_index -> BM_vert/edge/face_at_index - EDBM_uv_element_map_create/free -> BM_uv_element_map_create/free - ED_uv_element_get -> BM_uv_element_get