Add vidstabtransform filter option to make static zoom with crop without scaling.

[ioctl]

Now vidstabtransform filter outputs video with the same resolution as input.
Even with static zoom, video is scaled to the original size.

However, when the following additional explicit "scale" filter used, vidstab internal scale is useless, consumes cpu and reduces video quality.

So, please add an option to disable interpolation with the static zoom.