Filters for the image crop position

[sergej.mueller]

For a adjustable assignment of the crop start position.

Usage to make all crops start at (0,0):

add_action(
	'init',
	'set_image_crop_starts'
);
function set_image_crop_starts() {
	add_filter(
		'image_resize_dimensions_crop_start_x',
		function() {
			return 0;
		}
	);
	add_filter(
		'image_resize_dimensions_crop_start_y',
		function() {
			return 0;
		}
	);
}

media.php

Duplicate of #19393.