add visualization of open controlled gates [text drawer]

In PR #3739, open controlled gates were implemented. With that PR a new keyword argument was added to specify the control state,

XGate().control(3, ctrl_state=6)

This creates a 4 qubit gate where the first three qubits are controls and the fourth qubit is the target where the x-gate may be applied. A ctrl_state may alternatively be expressed as an integer string,

XGate().control(3, ctrl_state='110')

where it is more apparent which qubits are open and closed. In this case when q[0] is open and q[1] and q[2] are closed the x-gate will be applied to q[4].

What is the expected behavior?

[ewinston]

q_0 should be open and q_2 and q_3 closed.

[1ucian0]

I find very confusing that

...control(3, ctrl_state='110'), [qr[0], qr[3], qr[2], ...
                          ^^^      ^      ^      ^
                          ||\------/      |      |
                          |\--------------/      |
                          \----------------------/