refactor Visual Studio file importing #1403

Job	Run time
build (tsan, -DANALYZE_THREAD=On, false, thread, false, --executor=thread --error-exitcode=0)	13m 25s
build (asan, -DANALYZE_ADDRESS=On, true, process, false)	15m 14s
build (ubsan, -DANALYZE_UNDEFINED=On, true, process, true)	54m 41s
	1h 23m 20s

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