* Huge update for php-mezzio-ph generator:
- proper container support for data types
- support for query parameter references and query parameter schema references
- dependency update (PHP 7.3+, PathHandler 0.7+, DataTransfer 0.5+)
* Sample regeneration after rebasing for php-mezzio-ph
* - added custom CLI option for php-mezzio-ph to generate code using modern PHP syntax
- removed obsolete php-mezzio-ph samples in samples/openapi3/server/petstore/php-mezzio-ph
* - fixes for JavaDoc declarations that seems to break CI
* - fix for outdated sample file