Deoldify Vapoursynth filter

[Dan64]

If you can delay the release is better, I'm still working on improving the scene change detection algorithm.

I know that a threshold 0.02/0.05 is insane, but this setting is coupled with other procedures that filter out the frames not necessary.
I will add 2 additional parameters to control the filter process of frames not necessary.
This approach will allow to speed-up the coloring process with HAVC of about 2x.

Unfortunately the single thread approach is slowing down too much the encoding.
It is better to add the single thread as an option in the Coloring Panel (to avoid to set it globally with the Config).

Thanks,
Dan