Continuous integration (CI)

consolidated `joinClassNames` in `dom-node-class` subdirectory #562

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Run time

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Job	Run time
Test (18.20.4, macos-latest)	21s
Test (18.20.4, ubuntu-latest)	17s
Test (18.20.4, windows-latest)	1m 0s
Test (20.18.0, macos-latest)	27s
Test (20.18.0, ubuntu-latest)	16s
Test (20.18.0, windows-latest)	1m 9s
	3m 30s