[Feature] Pause display with space

[imsnif]

When the user presses space, we will pause the application - leaving what's on the screen so that they can read it with ease. Pressing space again should resume bandwhich.

While bandwhich is paused, it would be nice to have a visual indication for this: bonus points if it's noticeable but not annoying. :)

[stmobo]

Hi, I was hoping if maybe I could try and tackle this?

I'm a bit new to open source and to Rust, and I'm also busy with college, but I'm hoping that this won't go too awry...

[imsnif]

Hey @stmobo - looks like there's already an implementation for this in the works. Would love it if you pick up another issue though. If you don't find anything you like, drop me an email: aram@poor.dev and we can try and work out something you'd enjoy coding.

[zhangxp1998]

Implemented #106