Update bake UI

This example is just a incomplete idea; the idea behind these changes is to make baking easier and faster. How?

By selecting objects only once, each time you change an option in the materials or baking options, you simply press the Bake button, without having to select the models and then the image again. It also shows different bakes so you can create several at once, without the limitation of creating one by one.

I don't know if this is a topic under discussion or planned for the future.

Anyway, what do you think? What drawbacks or advantages might it have?