Deoldify Vapoursynth filter

[Dan64]

Till now I performed the tests using directly VapourSynth scripts.

Your version was not working as expected, but before boring you to apply the fixes I preferred to spend time to test better DeepRemaster to verify if it was really worth adding the method=5.

My tests confirmed the good performance of DeepRemaster in restoring old colored videos and I decided to change the name of method=5 in "HAVC video restore" and to write a specific function HAVC_video_restore to call directly when the method=5 is selected.

But I don't want boring you with other enhancements, and before provide the new RC2 I'd like to understand if you are interested to support this functionality in Hybrid.

Thanks,
Dan