Rename SuccessorsMixin to SuccessorsEngine (#75) #88

Job	Run time
ci / Build	3m 13s
ci / Typecheck	56s
ci / Test (0)	1m 38s
ci / Lint	54s
ci / Test (1)	1m 25s
ci / Test (2)	1m 40s
ci / Test (3)	1m 26s
ci / Test (4)	1m 52s
ci / Test (5)	1m 19s
ci / Test (6)	55s
ci / Test (7)	54s
ci / Test (8)	1m 24s
ci / Test (9)	1m 38s
ci / Publish Unit Tests Results	1s
	19m 15s

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