Add individual models to cli args

[ljleb]

Adds the following options to cli arguments:

	--checkpoint-dir path\to\dir	Add a path to a checkpoint directory.
	--config-dir path\to\dir	Add a path to a model config directory.
	--clip-dir path\to\dir		Add a path to a clip directory.
	--clip-vision-dir path\to\dir	Add a path to a clip vision directory.
	--controlnet-dir path\to\dir	Add a path to a controlnet or T2I checkpoint directory.
	--embedding-dir path\to\dir	Add a path to an embedding directory.
	--lora-dir path\to\dir		Add a path to a lora model directory.
	--style-model-dir path\to\dir	Add a path to a style model directory.
	--upscale-model-dir path\to\dir	Add a path to an upscale model directory.
	--vae-dir path\to\dir		Add a path to a vae directory.

Specifying the same option multiple times will add multiple directories instead of just one. For example, --checkpoint-dir E:\sd\ckpt --checkpoint-dir D:\sd2\finetunes will add both directories to the checkpoint search paths.

Feel free to edit the PR or ask for changes.

Closes #35

[ljleb]

This PR also normalizes the model names in config files to singular form, to minimize surprise when guessing config keys. Let me know if this is not wanted.

Note that I changed the arguments to reflect the model tags used in folder_paths.py.

Feel free to close this PR if you do not indent to support per-model cli argument.

[comfyanonymous]

I tried this and there's a few issues. The first one is that if a extra_model_paths.yaml is present it just crashes on startup. The second one is that UI doesn't work at all if you run it and open up: http://127.0.0.1:8188/

[ljleb]

With recent changes it is possible that the code no longer works. I'll take a look when I find some time.

[ljleb]

I personally don't need this anymore, feel free to add cli arguments in a new PR if you want.