New effect: R3V1Z3 Film Scratches

[revisualizer]

Simple and straightforward (hopefully) effect to simulate scratchy film noise from classic movies. The Interval slider lets you adjust how frequently new scratches are drawn. The effect was made on Shadertoy with lots of help from ChatGPT, then ported to ZGE using my conversion tool.



Quick demonstration:
https://www.youtube.com/watch?v=2gjT8OrJeow

This demonstration uses 3 of these effects in a row to simulate diverse noise:
- the 1st produces small dot-like scratches
- the 2nd generates the bulk of frequent noisy scratches
- the 3rd draws a strong, noisy line very infrequently

Original Shadertoy code for reference:
https://www.shadertoy.com/view/X3sGWl

Shadertoy to ZGE conversion tool:
https://r3v1z3.github.io/shadertoy2zge/