Display world screenshot previews and progress #667

Job	Run time
clickable (Debug, amd64, glew)	17m 16s
clickable (Debug, amd64, sdl)	15m 50s
clickable (Debug, armhf, glew)	18m 19s
clickable (Debug, armhf, sdl)	15m 57s
clickable (Release, amd64, glew)	22m 14s
clickable (Release, amd64, sdl)	21m 28s
clickable (Release, arm64, glew)	15m 50s
clickable (Release, arm64, sdl)	16m 27s
clickable (Release, armhf, glew)	15m 19s
clickable (Release, armhf, sdl)	20m 1s
	2h 58m 41s

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