Scanline crusher [WIP]

Browser tool for applying destructive effect to image that was created as attempt to recreate something close to GIMP "Wind" effect. Actually it adds some overall jitter and channel jetter (causing visible colour noise) which gives "aesthetic" analogue TV/video jitter/stutter effect, also there is accidentaly (due to logic bug in algorithm) found effect that intensifies jitter from top to bottom of picture. There are some params to control effect but for now they're hard-coded.