Provide ability to override the report filename format.

[metasim]

Currently the report file format is new File(config.reportDir, s"${title}.${language.ext}"), where title is the value of the setting licenseReportTitle. If your title is something like "Third-Party Licenses", it may be that one would rather the report be name third-party-licenses.html instead of Third-Party Licenses.html (which requires having the space escaped).