update yolo v8 to latest version (currently 11)

[jeffbl]

Yolo v11 looks like it is more efficient and accurate:

https://docs.ultralytics.com/models/yolo11/

Task is to update to this version, maintaining the same schema. Assuming it is mostly the same in terms of the currently yolov8 preprocessor, can just make the update in the current one, but rename to yolo (to be version agnostic for the preprocessor name), and give version and other info in the README.

Note this may impact #247, since different versions may do better/worse with different graphic input sizes. (In other words, I'd do the update first, then optimize graphic dimensions)