feat: add squigglevision filter

[olob0]

hand-drawn wobble via time-quantized noise displacement

multithreading based on the kaleid0sc0pe filter

demo:

demo.mp4

Kdenlive XML used for testing, for reference: https://gist.github.com/olob0/fef518577dd2c695402a6ce441f3c3c0

I'm new to this, so any feedback is welcome

[cookieukw]

I’ve always wanted this effect because, until now, we had to improvise using other effects to create it, and the results weren't all that great. Having a dedicated effect for this would be a huge help.