Display world screenshot previews and progress #1169

Job	Run time
gnulinux (32, ubuntu-20.04, gcc, Debug, OFF)	13m 30s
gnulinux (32, ubuntu-20.04, gcc, Release, OFF)	14m 7s
gnulinux (32, ubuntu-20.04, clang, Debug, OFF)	11m 16s
gnulinux (32, ubuntu-20.04, clang, Release, OFF)	12m 48s
gnulinux (64, ubuntu-20.04, gcc, Debug, ON)	15m 16s
gnulinux (64, ubuntu-20.04, gcc, Debug, OFF)	20m 54s
gnulinux (64, ubuntu-20.04, gcc, Release, ON)	13m 58s
gnulinux (64, ubuntu-20.04, gcc, Release, OFF)	27m 54s
gnulinux (64, ubuntu-20.04, clang, Debug, ON)	10m 22s
gnulinux (64, ubuntu-20.04, clang, Debug, OFF)	9m 39s
gnulinux (64, ubuntu-20.04, clang, Release, ON)	12m 33s
gnulinux (64, ubuntu-20.04, clang, Release, OFF)	10m 22s
	2h 52m 39s

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