* When --noUnusedLocals/--noUnusedParameters is disabled, add suggestions instead of errors
* Improve performance: do not add unused suggestion diagnostics unless asking for a suggestion
* Add "unused" flag to diagnostics
* Code review
* reportsUnused -> reportsUnnecessary
* Fix test
* Fix#19959 and #19958: Remove un-localizable messages
* Update message
* Reorder error messages
* Fix https://github.com/Microsoft/TypeScript/issues/15399: remove periods at the end of messages
* Accept baselines for error code changes
* accept baselines for removed periods
* Update diagnostic messages