Use `modules.paths.models_path` instead `modules.shared.model_path`.

Remove MPS detection to use CPU for GFPGAN / CodeFormer and add a --use-cpu command line option.

disabled printing prompts to console by default, enabled by --enable-console-prompts

Q&D Implementation of ScuNET, thanks to our handy model loader. :P

https://github.com/cszn/SCUNet

Yep.

Fix gfpgan_model_arch requirement(s).
Add Upscaler base class, move from images.
Add a lot of methods to Upscaler.
Re-work all the child upscalers to be proper classes.
Add BSRGAN scaler.
Add ldsr_model_arch class, removing the dependency for another repo that just uses regular latent-diffusion stuff.
Add one universal method that will always find and load new upscaler models without having to add new "setup_model" calls. Still need to add command line params, but that could probably be automated.
Add a "self.scale" property to all Upscalers so the scalers themselves can do "things" in response to the requested upscaling size.
Ensure LDSR doesn't get stuck in a longer loop of "upscale/downscale/upscale" as we try to reach the target upscale size.
Add typehints for IDE sanity.
PEP-8 improvements.
Moar.

support saving as half

added eta parameter to parameters output for generated images
split eta settings into ancestral and ddim (because they have different default values)

- Provides a better user experience
- Better suited to variable list of options
- Keep the UI "stable" as list contract or expand

Hook the model loader into the SD_models file.
Add default url/download if checkpoint is not found.
Add matching stablediffusion-models-path argument.
Add message that --ckpt-dir will be removed in the future, but have it pipe to stablediffusion-models-path for now.
Update help strings for models-path args so they're more or less uniform.
Move sd_model "setup" call to webUI with the others.
Ensure "cleanup_models" method moves existing models to the new locations, including SD, and that we aren't deleting folders that still have stuff in them.

Updated `downssample` to `down-sample`, matching spelling in other places.

ddim_eta & ddim_discretize