Manipulators should get a current simulation time as an argument (for scenarios)

[davidhjp01]

If an output of a scenario manipulator is time variant, we cannot accurately compute it because the manipulator function only accepts the delta time. For example, when the scenario event is set to trigger at t=5.5 but a user sets a step size of 1.

I suggest to pass the current simulation time to the manipulator functions to resolve this issue.