Major Upgrade with new UI and Support for Symfony 6.4

This release brings many upgrades and BC breaks.

The UI has been completely redesigned, using a more modern UI, and removing the use of annotations in preference for PHP native attributes.

Support for PHP versions less than 8.2 has been dropped.

Page serialization now uses the Symfony serializer, which simplifies the versioning of page data for the programmer.

Deserialization of objects no longer in DB

Changes to the Serializer, meant that objects once removed from the DB, could not be recreated when hydrated.
The fallback option has been implemented to fix this problem, and the objects will be newly created in the DB if a draft version is reverted in the PageAdmin

Fix onFlush event on pages

Problem: If the path and the template were changed, only the new path was saved.
Solution: The object is refreshed before calculating the the new changes

Fix PageCache 503 Server Error

Name of the cache key was causing issues. The exact reason is not clear

Fixes issue in FrontendPageController

The container method getParameter was removed.
Using AbstractController method getParameter instead

Change to Layout Block create form

Update LayoutBlockController.php

added new instance of classType to layoutblock content

v3.4.9

Fix major bug: hardcoded page id

v2.3.9: Update composer.json

change phpfastcache version