Add drag sides of crop box

[T8RIN]

Now it is only possible to drag corners, but it will be really helpful to add dragging for the sides of crop box too, like a 4 additional drag handles, which will be positioned at each edr of crop box

[SmartToolFactory]

Sure, i will add option to add center, corner or both in future releases.

[T8RIN]

Thank you a lot, that would be so helpful!!