[BUG] `pyqasm.draw()` gate ordering and "moments" across registers

[ryanhill1]

qasm = """
OPENQASM 2.0;
include "qelib1.inc";
gate iswap q0,q1 { s q0; s q1; h q0; cx q0,q1; cx q1,q0; h q1; }
qreg q[4];
creg c[4];
h q[0];
h q[1];
h q[2];
h q[3];
iswap q[2],q[3];
swap q[0],q[2];
swap q[1],q[3];
cx q[0],q[1];
cp(pi/4) q[2],q[3];
measure q -> c;
"""

import pyqasm

pyqasm.draw(qasm)

---

• RZ gate should come after swap gate. Currently one is drawn on top of the other.
• Measurements should all be grouped together at end of circuit drawing