Add 3D conformer support and MolOps expansion

[sharifhsn]

Note: This PR is stacked on #50. Unique files: conformer.{h,cc,rs}, mol_ops.{h,cc,rs} modifications, build.rs library links, test_conformer.rs, test_mol_ops_expanded.rs.

3D conformers

let mut mol = ROMol::from_smiles("CCO").unwrap();

// Generate 3D coordinates
let conf_id = mol.embed_molecule();
assert!(mol.conformer_is_3d(conf_id));

let (x, y, z) = mol.atom_position(conf_id, 0);

// Or 2D depiction coordinates
let conf_id = mol.compute_2d_coords();
assert!(!mol.conformer_is_3d(conf_id as i32));

// Multiple conformers for ensemble analysis
let ids = mol.embed_multiple_confs(10);
assert_eq!(mol.num_conformers(), 11); // 1 from before + 10 new

Links: DistGeomHelpers, Depictor, RDGeometryLib, EigenSolvers, ForceField, ForceFieldHelpers, PartialCharges.

MolOps expansion

// Split disconnected structures
let mol = ROMol::from_smiles("CCO.CC.[Na+].[Cl-]").unwrap();
let frags = get_mol_frags(&mol);
assert_eq!(frags.len(), 4);

// Formal charge
assert_eq!(get_formal_charge(&ROMol::from_smiles("[NH4+]").unwrap()), 1);

// Aromaticity and stereochemistry perception
set_aromaticity(&mut rw_mol);
assign_stereochemistry(&mut mol);

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