Advanced Controls Simulations - Sim Functionality Fixups and Tweaks

[gerth2]

Once https://github.com/wpilibsuite/frc-docs/pull/1821 is merged...

• For turret and arm, make the user click correspond to the setpoint at t = 1, not t = 0. This should allow the user to clearly see what the "zero" state for the system is.
• On at least some sims, repeatedly toggling system noise on and off will, sometimes, leave noise in the input signal. Not clear on root cause - debug to ensure that whenever the box is not checked, no noise is present.