Add sd-webui-incantations

[v0xie]

Info

https://github.com/v0xie/sd-webui-incantations Implements multiple algorithms to increase image quality and prompt following.

Personally, I think Perturbed Attention Guidance is a big enough deal to be implemented upstream. It's kind of insane how much better generated images are when it's combined with CFG. See the official project page: https://ku-cvlab.github.io/Perturbed-Attention-Guidance/

Checklist:

• [x] I have read the Readme.md
• [x] The description is written in English.
• [x] The index.json and extension_template.json have not been modified.
• [x] The entry is placed in the extensions directory with the .json file extension.

[w-e-w]

seems to work without bugs even though I don't have time to understand what you actually doing here