Save prompts

Detailed Description: Add the ability to fave a group/session of prompts per generator. This could be added to the "Prompt helper" menu, in a subdivision called "favorites", where we would have the list of saved prompts. Ideally we could also name them, something like "I used these prompts to generate this".

When clicked, they would automatically be copied into the prompts box and we could use them to generate the images. (It could also include the negative prompts).