Function Shuffle for vctrans vapoursynth Plugin

#
Shuffle

The transition from Clip A to Clip B occurs similar to movement in Shuffling of a pack of cards. The direction of shuffle is an option..

## trans.Shuffle(clip, clipb clip[, float overlap = 1.0 ][, int dir = 1] )

Parameter description:
clip : A clip. Constant format.
clipb : B clip. Must have identical format of A clip
overlap : transition time length in seconds. Floating point. Must correspond to at least 8 frames.
dir : 1 to 4. 1:Up 2: Right 3: Down 4: Left
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