Deoldify Vapoursynth filter

[Dan64]

Hello Selur,

  I found a regression bug in the last dev version.

  If I select for example the method "external ClipRef same as video", Hybrid should allow to select a file in input, but instead it possible to select only a directory

  

  Moreover I decided to add the Retinex filter in HAVC, this is a patched version with no defect (no need to load the plugin in the script), so please change the name of the "B&W mode" in HAVC and ColorAdjust from "SATA - auto brighness&constrast" in "Multi-Scale Retinex on Luma".

Thanks,
Dan