* 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
1. Remove checkJSDocFunctionType in favour of checkSignature.
2. Check that 'new', in addition to 'this', must be the first parameter.
3. Remove prematurely added JSDoc-quickfix test.