Display world screenshot previews and progress #1172

Job	Run time
gnulinux (32, ubuntu-20.04, gcc, Debug, OFF)	13m 57s
gnulinux (32, ubuntu-20.04, gcc, Release, OFF)	12m 59s
gnulinux (32, ubuntu-20.04, clang, Debug, OFF)	15m 3s
gnulinux (32, ubuntu-20.04, clang, Release, OFF)	10m 52s
gnulinux (64, ubuntu-20.04, gcc, Debug, ON)	14m 57s
gnulinux (64, ubuntu-20.04, gcc, Debug, OFF)	16m 1s
gnulinux (64, ubuntu-20.04, gcc, Release, ON)	16m 30s
gnulinux (64, ubuntu-20.04, gcc, Release, OFF)	20m 54s
gnulinux (64, ubuntu-20.04, clang, Debug, ON)	11m 25s
gnulinux (64, ubuntu-20.04, clang, Debug, OFF)	9m 5s
gnulinux (64, ubuntu-20.04, clang, Release, ON)	10m 7s
gnulinux (64, ubuntu-20.04, clang, Release, OFF)	9m 38s
	2h 41m 28s

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