Support hard links for similar images and videos with `-L` #595

Job	Run time
linux-appimage-gui (stable, release)	5m 15s
linux-gui (stable, release)	5m 22s
linux-krokiet-gui (stable, release)	12m 18s
linux-tests (stable, debug)	12m 34s
linux-gui (1.72.1, release)	6m 1s
linux-krokiet-gui (1.72.1, release)	7m 24s
linux-krokiet-gui-heif (stable, release)	13m 58s
linux-krokiet-gui-heif (1.72.1, release)	8m 14s
	1h 11m 6s

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