Implement parts of `LegoCarBuild` and dependents #4516

Job	Run time
MSVC 4.20	1m 44s
Current MSVC	2m 21s
Current msys2 mingw32	4m 1s
Current msys2 clang32	5m 14s
Download original binaries / fetch	5s
Compare with master	1m 45s
Upload artifacts	0s
	15m 10s

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