Add ECS storage #175

Job	Run time
build (macos-latest, clang, clang++, Debug)	1m 43s
build (ubuntu-latest, gcc, g++, Debug)	53s
build (macos-latest, clang, clang++, Release)	1m 15s
build (windows-latest, cl, msvc, Release)	1m 0s
build (ubuntu-latest, gcc, g++, Release)	42s
build (windows-latest, cl, msvc, Debug)	1m 1s
	6m 34s

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