Using Stable Diffision models for Colorization

[Dan64]

Hello Selur,

  see my post on github: https://github.com/vapoursynth/vapoursyn...4620507489
  let me know, if you can replicate my results (the clip preview will frozen after 100-500 frames).
  The havc_test is a simplified version (all the functions regarding colorization and network connections are no-op).
  Honestly on my side, in some case, the preview is freezing already on BestSource call.

Dan