Function Scratch for vctrans vapoursynth Plugin

#
Scratch

The transition from Clip A to Clip B occurs as scratching off on a scratch card of A frame , in various styles, revealing B Frame.

## trans.Scratch(clip, clipb clip[, float overlap = 1.0 ][, int style = 3] )

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.1.0 sec or longer recommended.
style : 1 to 7. 1:TV Noise 2: Dust 3: Rain 4: Laser beams 5: Water fountain 6: Vertical lines 7: Horizontal lines.
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