add "crop_type" parameter for user friendly round image rendering

[mdtanrikulu]

To support round image components adjust logo and text overlay if crop_type=round parameter provided.

[mcmns]

In case it’s helpful, here’s an example of how another NFT project handles providing alternative images for avatars and banners. (They don’t have the challenge of designing text over images, but it’s interesting to see how they’ve chosen to reposition, resize, and omit certain elements depending on the ratio/anticipated crop.)

Importantly, the “avatar” image — equivalent to the proposed “crop_type=round” parameter — doesn’t crop the image to be a circle, it repositions the foreground elements to look good when cropped to a circle by third parties.