Fix memory leaks and code quality in autotile code #750

Job	Run time
clickable (Debug, amd64, glew)	17m 29s
clickable (Debug, amd64, sdl)	17m 1s
clickable (Debug, armhf, glew)	20m 58s
clickable (Debug, armhf, sdl)	18m 0s
clickable (Release, amd64, glew)	22m 26s
clickable (Release, amd64, sdl)	15m 44s
clickable (Release, arm64, glew)	16m 41s
clickable (Release, arm64, sdl)	22m 2s
clickable (Release, armhf, glew)	18m 43s
clickable (Release, armhf, sdl)	16m 43s
	3h 5m 47s

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