Sitegen history mode + new Maven plugin to help with aggregated javadocs #519

Job	Run time
shellcheck	10s
copyright	19s
build	2m 36s
checkstyle	34s
spotbugs	2m 37s
javadoc	1m 2s
cli/linux-amd64	1m 56s
vscode-extension	58s
tests/cli-linux	2m 2s
cli/windows-amd64	3m 52s
tests/cli-windows	4m 4s
cli/darwin-amd64	4m 3s
tests/cli-functional-linux	3m 43s
tests/cli-functional-windows	4m 53s
tests/archetype-linux	1m 50s
tests/archetype-windows	3m 10s
tests/linker-linux	1m 45s
tests/linker-windows	3m 10s
tests/misc-linux	3m 6s
tests/misc-windows	4m 51s
	50m 41s

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