Explosion light sprite fades in and out smoothly (#3048) #2619

Job	Run time
clickable (Debug, amd64, glew)	11m 38s
clickable (Debug, amd64, sdl)	11m 33s
clickable (Debug, armhf, glew)	11m 7s
clickable (Debug, armhf, sdl)	10m 13s
clickable (Release, amd64, glew)	11m 33s
clickable (Release, amd64, sdl)	10m 46s
clickable (Release, arm64, glew)	11m 29s
clickable (Release, arm64, sdl)	10m 50s
clickable (Release, armhf, glew)	10m 2s
clickable (Release, armhf, sdl)	9m 46s
	1h 48m 57s

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