Add ScuNET Denoiser/Upscaler, Fix some Model Loader issues

Save Button file and directory naming

Add progress bar for SwinIR upscale in cmd

I do not know how to add them to the UI...

unused code removed from outpainting mk2

ALT + return will submit prompt when it's in focus

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

https://github.com/cszn/SCUNet

Child classes only get populated to __subclassess__ when they are imported. We don't actually need to import any of them to webui any more, so clean up webUI imports and make sure loader imports children.

Also, fix command line paths not actually being passed to the scalers.

Fix LDSR, BSRGAN, recursive SD checkpoint Loading