Deoldify Vapoursynth filter

[Selur]

@Dan64: about the chroma resize, instead of

clip_colored = clip_colored.resize.Lanczos(width=clip_orig.width, height=clip_orig.height)

I would suggest to use Spline64 instead of Lancos, to avoid the introduction of ringing&halo artifacts. (see: https://forum.doom9.org/showthread.php?t=145210)

Cu Selur