Sitegen history mode + new Maven plugin to help with aggregated javadocs #520

Job	Run time
shellcheck	20s
copyright	24s
checkstyle	44s
build	2m 15s
javadoc	1m 6s
spotbugs	2m 37s
cli/linux-amd64	1m 54s
tests/cli-linux	2m 41s
cli/windows-amd64	3m 51s
vscode-extension	57s
tests/cli-windows	1s
cli/darwin-amd64	5m 57s
tests/cli-functional-linux	2m 43s
tests/cli-functional-windows	1s
tests/archetype-linux	2m 3s
tests/archetype-windows	1s
tests/linker-linux	2m 2s
tests/linker-windows	1s
tests/misc-linux	2m 22s
tests/misc-windows	1s
	32m 1s

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