[INFO] Feature, add/update rife frame interpolation

[Brutoloco]

I'm testing it, from vapoursyth preview seems that the frames coincide with time. I encoded a video 23,976... to 60fps, the result is 60fps, audio is sync.

As soon as I opened it I found a problem with the "skip threshold" option of frame interpolation -> rife
Preview fails with this option and gives this log in red:

Failed to evaluate the script:
Python exception: DuplicateFrames: out of bounds frame number

Traceback (most recent call last):
File "src\cython\vapoursynth.pyx", line 2890, in vapoursynth._vpy_evaluate
File "src\cython\vapoursynth.pyx", line 2891, in vapoursynth._vpy_evaluate
File "E:\Temp\tempPreviewVapoursynthFile12_48_51_333.vpy", line 26, in
clip = core.rife.RIFE(clip, model=9, fps_num=60, fps_den=1, sc=True, skip=True) # new fps: 60
File "src\cython\vapoursynth.pyx", line 2636, in vapoursynth.Function.__call__
vapoursynth.Error: DuplicateFrames: out of bounds frame number