Add Model option about config-presets

[Zyin055]

I'm hesitant to add too many fields to the presets since it reduces their flexibility.

If I could find a way in the code to not update components if they are omitted from the config then then I'd consider it, but I can't figure out how to do that.

[Zyin055]

I tried adding the model as a config preset with the new "Add tracked fields..." button, but those top row buttons are actually part of the web ui settings and are out of scope for the config preset dropdown to manipulate with the way extension is currently implemented.

Adding the model, or anything else in the top row of the web ui, would require custom attention that this extension isn't designed for.

[Symbiomatrix]

@Zyin055 Personally I don't have much use for model swapping, but if you want, you could connect certain preset keys to lambda functions, which are then called along with a value change. It's a fairly simple and dynamic method, though naturally it would still require extra research on webui's infrastructure per such preset. I've used that method in regional to apply loading & colour correction to the mask preset.
modules.sd_models.load_model