EZP-20424 - Page\Parts\Item should not extend Base since it doesn't need PageService
EZP-20424 - Added missing properties in Page\Parts\Block and $customerAttributes now defaults to null instead of array()
EZP-20424 - Added missing $layout property in Page\Parts\Page
EZP-20424 - Removed Page\Parts\Page::getZone() since zones are now indexed by zoneId
EZP-20424 - Fixed several issues in Page legacy converter
EZP-20424 - Added tests for Page legacy converter