Add features to LuLu settings window.

[kevinm6]

Hi, I’m creating this discussion instead of open an issue because maybe it's a wanted behaviour.
I like a lot LuLu but usually I don’t use the menu bar icon because I prefer keep it as clean as possible.
However, lately, I enabled the icon since I figured out that I was missing some functionalities like Export/Import Rules and other similar things.

Could you consider add the way to use that features even from the LuLu Window, I think that especially the export rules is one feature not really intended to be on the menu bar to be easy to find and use often.
Thanks for the amazing app!