Zen: Terminal integration planned?

[minusfive]

Hey @folke,

I've been a long time Zen Mode + Twilight user and one of the things I loved was its terminal integration to tweak font size (really handy for demos, and just nice in general for focused writing).

I've now switched to Snacks.zen, and was wondering whether this is something you were planning to port? I may give it a go if this is not on your TODO. Is that a PR you'd consider?

Thanks for all the hard work!