Update movement properties/signals for programatic flick.

The flick() function seeks to emulated a real flick programmatically, and it would be useful if the movement properties/signals were updated. This would allow, for example, onMovementEnded to implement logic that was used whenever the view stopped moving (whether user initiated or programmatically initiated). If the distinction was still desired, it might be possible to indicate this in other ways (e.g. via a signal parameter).

Manual control without these properties/signals being updated would also still be possible via contentX/Y.

The attached example demonstrates the current behavior. The example can be clicked to trigger a programmatic flick.