Allow mixed image sizes in TI/HN training

CI: Use native actions/setup-python caching

Remove fallback for Protocol import and remove Protocol import and remove instances of Protocol in code
add some whitespace between functions to be in line with other code in the repo

Add fallback for Protocol import

Add support for loading VAEs from safetensors files

Update hints.js

add a visual effect to inactive hires fix elements

Fix quicksetting name overlapping with its controls.

Fix training for newer PyTorch builds

Use an actual label for feature requests.

remove calls to locals()
add a test for img2img with script

Run scripts from API

Partial revert

increase upscale api validation limit

Add Birch-san's sub-quadratic attention implementation

Small touch up to hints

rework hires fix preview for #6437: movie it to where it takes less place, make it actually account for all relevant sliders and calculate dimensions correctly