Add ability to select canvas size based on uploaded image

[AchoArnold]

Hello,

I noticed, there's a new Canvas Settings which means when I upload my image, it get's resized to 1920 X 1200 Please allow a setting to "disable" this or perhaps make it such that I can automatically resize the canvas into the same size as my uploaded image.

Thanks.

[daveearley]

Thanks for the suggestion @AchoArnold. It would make sense to set the canvas size relative to the image alright.