-Updated the built-in 'High' model to DepthAnything3 Mono Large

~I finally had some time to mess with this again and somehow managed to figure out how to get the DA3 models baked into onnx while still supporting both variable resolution input and fp16
~At least for now only the large model is used as for some reason on small and base models for DA3 the quality is really bad? In my testing anyway, maybe because they're not specifically mono versions idk.
~This should be a straight upgrade over DA2 though as I've observed much better overall relative scaling and details. Faces on DA2 looked pretty weird off angle, but now they look pretty decent still I think.
~I made this the default model when using 'auto' and you have a cuda capable GPU, for anyone else it can be forced on by selecting high in the advanced settings. The performance is probably still fine for images.

-Image foreground/background clip now saves with per-image settings

-Added a hand size slider in the visualization setting of the toolbox

-Added a new model setting "Manual" which disables the depth generation for images

~If you really like tinkering, this can perhaps be used to set up an external tool to handle generating depth for images.

~The depth gen window will still be opened to handle generation for videos as that is a much more tightly integrated process.

~Whatever custom solution just needs to read the files paced in steamapps/common/AutoDepth Image Viewer/Midas3/input and put whatever output into the corresponding output folder

~pfm and 16bit grayscale png are supported