Merge #3929 Modernize build system and .NET platform targets #1357

Job	Run time
build_NetCore (Debug_NetCore)	50s
build (latest, Debug)	1m 28s
build_NetCore (Release_NetCore)	49s
build (latest, Release)	1m 45s
build (6.12, Debug)	1m 29s
build (6.12, Release)	1m 46s
build (6.10, Debug)	1m 26s
build (6.10, Release)	2m 7s
build (6.8, Debug)	1m 28s
build (6.8, Release)	2m 4s
	15m 12s

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