Display world screenshot previews and progress #2652

Job	Run time
clickable (Debug, amd64, glew)	5m 26s
clickable (Debug, amd64, sdl)	4m 58s
clickable (Debug, armhf, glew)	4m 48s
clickable (Debug, armhf, sdl)	4m 42s
clickable (Release, amd64, glew)	5m 15s
clickable (Release, amd64, sdl)	5m 2s
clickable (Release, arm64, glew)	5m 30s
clickable (Release, arm64, sdl)	5m 5s
clickable (Release, armhf, glew)	4m 47s
clickable (Release, armhf, sdl)	4m 43s
	50m 16s

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