Make use of (new) macOS features

[pontus]

Hi,

I have this feeling that Alfred is a bit isolated from the macOS UI and have some ideas:

- Widget that let you choose from the external triggers. 
- Widget that displays a list filter result. 
- Add choosen external triggers to menu bar icon menu.

- Register Alfred and external triggers/universal actions as Extensions in macOS. I could see uses for all possible (sharing, file, actions, preview, photo, quick actions..)

To make this realistic I think the Native app would need to have an UI handling what shows up where.