Added option to add multiple extra models dirs separated by colons

[Natans8]

Useful for people who store models both locally and remotely, this is the simplest implementation I could think off.

[Bing-su]

Thanks for your contribution!

In Windows, colon is used as a drive symbol (eg. C:\stable-diffusion-webui), so you need to use a different separator. It would be nice if you change the example to be Windows friendly as well.

[sonarqubecloud]

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[Natans8]

Thanks for your contribution!

In Windows, colon is used as a drive symbol (eg. C:\stable-diffusion-webui), so you need to use a different separator. It would be nice if you change the example to be Windows friendly as well.

Thank you for the quick response!
I changed the delimiter to |, which is a reserved character on windows, so now it should work on both. UNIX doesn't really have any reserved characters other than \ and NULL but this one should be really uncommon in most cases.

The more elegant long-term solution would be to convert the Textbox component a Gradio Dataset component or something similar, but the transition from previous versions wouldn't be as smooth, and I'm not experienced enough in Gradio to deal with that.