Save Models in baseModel subfolder

[aimerib]

Add the functionality of reading baseModel from civitai metadata, and save models in their base model subfolders. This will look like: Models/Stable-diffusion/ SDXL 1.0/ SD1.5/ Pony/ Flux.1 D/ Flux.1 F/ etc...

This is exactly the same changes as shared in Discord. I welcome any feedback and I'm happy to make any changes necessary. This is just my own little patch that I apply after any updates because I like my models to stay organized in basemodel subfolders since it helps identify them at a glance in the UI.