Display world screenshot previews and progress #2781

Job	Run time
clickable (Debug, amd64, glew)	11m 45s
clickable (Debug, amd64, sdl)	11m 14s
clickable (Debug, armhf, glew)	11m 8s
clickable (Debug, armhf, sdl)	10m 19s
clickable (Release, amd64, glew)	11m 32s
clickable (Release, amd64, sdl)	10m 57s
clickable (Release, arm64, glew)	11m 35s
clickable (Release, arm64, sdl)	11m 25s
clickable (Release, armhf, glew)	10m 19s
clickable (Release, armhf, sdl)	10m 22s
	1h 50m 36s

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