forge and gradio4 compatibility

[graemeniedermayer]

Forge uses gradio version 4 which makes a number of breaking changes.

Some of the most noteworthy

• removal of gr.Box() replaced by gr.Group(). The padding and borders do appear differently maybe extra styling is need.
• file type must be binary instead for file loaders
• significantly the depreciation of update on components.

Removes the deprecated .update() method from component classes. Instead, you can now just return an instance of a component from your function. I.e. return gr.Textbox(lines=4) instead of gr.Textbox.update(lines=4)

https://github.com/gradio-app/gradio/issues/6339

This led me to re-instantiating a number of components. Perhaps this can be further simplified.

I split off all the gradio4 files although maybe there's a clever way to fold them back in.