Request: Image Ratio

[Duemellon]

I'm glad someone gave this project some attention. I hope it'll energize you to come back & add a few items to the Canvas tab for the use that https://www.youtube.com/watch?v=fotVrleRgi4 highlighted.

Can you add an Aspect Ratio option with some common presets?
1:2 (250x500)
1:3 (166x498)
2:3 (332x498)
3:4 (375x500)
9:16 (279x496)

With a Horiz v. Vert toggle? Then let us reinit the Canvas space?