Lookup-texture style animations

[guysv]

Basically I watched https://www.youtube.com/watch?v=HsOKwUwL1bE and figured having tools within rx to do LUT pixel art animations can be cool.

I wanted to hear if you will be interested in merging such a feature.

Here's the demo:

https://github.com/cloudhead/rx/assets/32539816/0484fee5-9c2c-4963-8dd8-69c3a061eaa5

I got plans to improve the UX and allow exporting the lookup table, and the lookup-table animations in a standalone spritesheet.

[lowagner]

@guysv not to butt in where i'm not wanted, but i might be interested in merging such a feature on https://github.com/lowagner/pim. i have made a ton of changes since rx went silent, however, so it probably won't be a simple copy paste. if you're interested in updating to the other style, you are more than welcome, but if not please leave this branch around for me to take notes on.