Prototyped "step builder" approach to the interface builder for feedback #862

Job	Run time
Correctness-MacOS (g++, Release, all)	32m 17s
Correctness-MacOS (g++, Release, none)	20m 29s
Correctness-MacOS (g++, Debug, all)	16m 1s
Correctness-MacOS (g++, Debug, none)	23m 35s
Correctness-MacOS (clang++, Release, all)	19m 14s
Correctness-MacOS (clang++, Release, none)	21m 0s
Correctness-MacOS (clang++, Debug, all)	17m 20s
Correctness-MacOS (clang++, Debug, none)	19m 8s
	2h 49m 4s

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