EZP-20424 - Fixed wrong "id" property assignment for Page\Parts\Item
EZP-20424 - Added get*ByIndex() methods in Page\Parts\Page and Page\Parts\Zone for convenience
EZP-20424 - Exposed page service in Page\Value
EZP-20424 - Page\Parts\Base must be abstract
EZP-20424 - Added init() abstract method to Page\Parts\Base to be able to initialize properties specifically + Zones/Blocks are now numerically indexed
EZP-20424 - Enhanced Page\PageService with several helper methods
EZP-20424 - Added a PageService in legacy bundle extending the original one
EZP-20424 - Added base Twig template block for ezpage