PathAnimator - Add option to limit the frames created for RotAux cache layer beyond the ResultLayer frames

[Gasparoken]

3 options should be available:

• Generate RotAux cache layer with the frames needed (max performance when running multiple times the script with the same image).
• Avoid to make any RotAux cache layer (good to avoid erasing the trail of empty frames and have a clean timeline.).
• Limit the frames of RotAux cache layer to the frames of the ResultLayer animation (intermediate option between the two previous options).