Enhanced physics for the Arrow III (with Fan Railer)

[YoRyan]

We can be much more faithful to the real thing compared to vanilla. Here's what needs to change:

Blended braking needs a redo. See Fan Railer's video of a station stop: The initial brake application is made with air, which then backs off in favor of dynamics, followed by air again when the dynamics lose their effectiveness.

The ramp up time for the throttle should be significantly quicker than the stock 5 seconds. And a similar ramp needs to be introduced for the dynamic brakes.

We need to apply a workaround for that old Railworks bug where the dynamics are more effective the longer the MU consist is.

As always, Fan Railer will ship the physics curves, and OpenNEC will provide the script.