feat: add 'replace_output' props to plugin, allowing plugins to modif… #151

Job	Run time
build-and-test (macos-latest, 18.x)	4m 52s
build-and-test (ubuntu-latest, 18.x)	4m 49s
build-and-test (macos-latest, 20.x)	4m 51s
build-and-test (ubuntu-latest, 20.x)	4m 50s
build-and-test (windows-latest, 18.x)	4m 36s
build-and-test (windows-latest, 20.x)	4m 32s
	28m 30s

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