Deoldify Vapoursynth filter

[Dan64]

I just released the new version: https://github.com/dan64/vs-deoldify/rel...tag/v4.5.2

I noted that in the current Hybrid version is set num_threads=1.



unfortunately this setting is slowing down the process too much and the problems introduced with the multi-thread are not so big to justify such slowdown.

It would be nice if you can add an option for this setting, so that the user can decide if it will accept the slowdown or not.

Thanks,
Dan