Silent mode for `headerCreate`? (feature request)

[deeplook]

I'm using the AutomateHeaderPlugin to create/update headers with every compile. Given that this always reports all touched filenames in the output leads to additional clutter in log files when running in CI. A nice-to-have feature would be to have a silent mode which reports only a summary like the number of touched files. I think scalafmt is doing something like that.

[britter]

@hseeberger maybe it's possible to pass some Marker when writing log messages to that users can simply turn off all log messages from this plugin?

[hseeberger]

I don't know ...