Deoldify Vapoursynth filter

[Dan64]

Hello Selur,

  I noted that you removed the flag "Reference Frames only".

 

  I know the reasons for the removal, but this flag is useful for a more advanced colouring process.
  I understand that this filter is quite complex to use, this complexity is also due to the fact that Hybrid is suitable mainly for advanced users.
  I'm planning to write a Colouring Guide for using HAVC in Hybrid to simplify the usage of this filter and reduce its complexity.
  Allowing people with no experience of Vapoursynth and Hybrid to use HAVC.  
  In order to simplify the usage to people with little knowledge of Vapoursynth it will be very useful if you can introduce again in Hybrid the flag "Reference Frames only".
This flag should be enabled when "Ref FrameDir" is set (not empty).

Thanks,
Dan