Add resetStepWhenSkipped option

Add a `resetStepWhenSkipped` option so that when the next step is navigated to whilst the current one is still animating, the current step's animations get reset back to their starting position.

This will need to be integrated with the `fadeStepWhenSkipped` option so that the reset occurs after the fade if enabled.

Start by locating the existing fadeStepWhenSkipped option and the code handling navigation to the next step while the current step is animating. Add resetStepWhenSkipped behavior so animations return to their starting position, with the reset occurring after the fade when fading is enabled; verify both option combinations.

Written by the indexing model from the issue text.