Fixed the validation of duplicate full Page URL
Fixed bug: LayoutBlockListener was listening for the wrong gallery object
Fixed bug: infinite loop caused by flushing persisted page when calling autoPageDraft() method
remove dump from template
[BC BREAK] Introduced the ContentRoute Object depends on a new field templateName

* Use the Template Key and not the template path to select templates in the page form
* Added field templateName to the ContentRoute object so that the same twig template can be used but with different parameters
* Added ContentRouteListener so that the controller field is automatically updated/inserted when selecting a template
addition of change log
addition of UPGRADE.md file and completion of CHANGELOG.md file