Allow the program! macro to pass arguments to the gates.

[Renmusxd]

Would allow for calls which pass arguments on to the gate creating functions:

program!(&mut b, r,
    rz(pi/2.0) r;
    control(0) rz(pi) r[0] r[1]
)

POC in branch program_args which only allows a single argument to be passed. Argument lists would increase complexity significantly.

For use case see #31

[Renmusxd]

First iteration done in 02db6cc and 32044a5. Only single arg currently allowed.

[Renmusxd]

Invalidated with #39