Feature request: make scriptable

In order to use DiffusionBee with an (Apple) script, all menu items need to be present in the menu. I would propose to add the following entries:

- File -> Import text from clipboard
- File -> Generate
- File -> Save Image

This way we could write an Apple Script like the following (pseudo code):

```
for artist in ["Wassily Kandinsky", "Vincent van Gogh", "Pablo Picasso"]
set clipboard text to `horse, painting by ${artist}`
tell app DiffusionBee to to "Import text from clipboard"
wait one minute
tell app DiffusionBee to to "Save Image"
```

It would be great if it was possible to specify where the image is saved to and what the name is, e.g. `~/my-experiment/horse-by-picasso.png`.

When a certain action is not possible (e.g. "Save Image" before an image was generated), the menu entry would need to be greyed out.