Display world screenshot previews and progress #2657

Job	Run time
clickable (Debug, amd64, glew)	11m 40s
clickable (Debug, amd64, sdl)	11m 5s
clickable (Debug, armhf, glew)	10m 59s
clickable (Debug, armhf, sdl)	10m 7s
clickable (Release, amd64, glew)	11m 23s
clickable (Release, amd64, sdl)	10m 59s
clickable (Release, arm64, glew)	11m 10s
clickable (Release, arm64, sdl)	11m 6s
clickable (Release, armhf, glew)	10m 17s
clickable (Release, armhf, sdl)	10m 15s
	1h 49m 1s

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