Alec Edgington

Use `Phase` nodes instead. `RemoveRedundancies` can consolidate multiple `Phase` nodes into a single one. The `Circuit` property can be kept and set to zero for backwards compatibility until we decide...

```python from pytket.circuit import Circuit from pytket.qasm import circuit_to_qasm_str c = Circuit() areg = c.add_c_register("a", 2) breg = c.add_c_register("b", 2) creg = c.add_c_register("c", 2) c.add_c_and_to_registers(areg, breg, creg) mbop = c.get_commands()[0].op...