[FEATURE] Automatic split by white or black "lines"

[mykeehu]

Some comics do not have panels of fixed height, so they cannot be cut properly. The width of these panels is usually the same, but the height is not, so an automatic height detector would be good, which detects the height of the images based on the white or black background and crops them accordingly. Note that sometimes figures or chat bubbles hang over the image.

[BishrGhalil]

@mykeehu Interesting feature, I'll implement it in the next version.

[mykeehu]

@BishrGhalil thank you, because I simply cannot cut the strips of panels of different heights. I don't know how you could detect the height of a panel as an autocrop