Deoldify Vapoursynth filter

[Dan64]

Hello Selur,

   I reworked the code, to simplify the reading and released a new RC3 (attached).
   Now the file _init_.py contains only the function HAVC_main()

   The function HAVC_main is important because it implement all the HAVC filter combinations.

   I added also the function HAVC_read_video, that mimic what usually Hybrid does when must read a clip.
   It was necessary because HAVC_main must be able to use all the filters without additional input at the exception of the clip to colorize.  
  
   The implementation of methods 0-4 in Hybrid was already Ok.
   For the method=5 it necessary to manage in special way the field RefDir/File.
   I included in the attachement 2 examples of method=5 usage, so that should be easy to understand the implementation in the GUI.
   In the attachment there is also an updated version of the HAVC_diagram.

Thanks,
Dan