Merge branch 'wesnoth:master' into master #29

Job	Run time
checks	2m 44s
mingw	44m 32s
flatpak	36m 2s
macos-intel (Debug)	50m 20s
macos-intel (Release)	58m 57s
steam-runtime	21m 53s
translations	8m 11s
windows (Debug)	29m 55s
windows (Release)	46m 19s
ubuntu (scons, gcc, g++, release, true)	28m 49s
ubuntu (cmake, clang, clang++, debug, false)	34m 12s
notification	15s
	6h 2m 9s

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