Merge auto-generated keys when diffing tables

[Zatnosk]

Creating a foreign key without a backing key makes the database auto-generate a relevant backing key.

DBTool can't recognize that these two are related and reports differences from file structure.

Minimal example:

CREATE TABLE `table_b` (
	`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
	PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

CREATE TABLE `table_a` (
	`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
	`b_id` int(10) unsigned NOT NULL,
	PRIMARY KEY (`id`),
	FOREIGN KEY (`b_id`) REFERENCES `table_b` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;