Add a flip-action option for sprite actions (#2558) #11

Job	Run time
clickable (Debug, amd64, glew)	20m 40s
clickable (Debug, amd64, sdl)	16m 24s
clickable (Debug, armhf, glew)	16m 18s
clickable (Debug, armhf, sdl)	17m 45s
clickable (Release, amd64, glew)	16m 14s
clickable (Release, amd64, sdl)	15m 36s
clickable (Release, arm64, glew)	19m 25s
clickable (Release, arm64, sdl)	17m 48s
clickable (Release, armhf, glew)	19m 40s
clickable (Release, armhf, sdl)	23m 36s
	3h 3m 26s

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