Somewhat error-prone, so please review carefully. Reasons we need this: - Some file types are not properly handled by the script. - The only exclusion mechanism we currently have (`NO_AUTO_COPYRIGHT`) is overly coarse. CHANGELOG_BEGIN CHANGELOG_END
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copyright update 2020 * update template * run script: `dade-copyright-headers update .` * update script * manual adjustments * exclude frozen proto files from further header checks (by adding NO_AUTO_COPYRIGHT files)
