LPS-27530 Refactoring path check in export to base class for staged model data handlers
LPS-27530 Making NAMESPACE to be public, more refined refactoring is coming up for data handler constants
LPS-27530 Moving BookmarksEntry export/import logic to new staged model data handler
LPS-27530 Moving BookmarksFolder export/import logic to new staged model data handler
LPS-27530 Path methods in BookmarksPortletDataHandlerImpl are obsolete - see StagedModelPathUtil
LPS-27530 Applying changes to BookmarksEntryDataHandlerImpl according to the new environment
LPS-27530 Applying changes to BookmarksFolderDataHandlerImpl according to the new environment
LPS-27530 Applying changes to BookmarksPortletDataHandlerImpl according to the new environment
LPS-27530 Registering new staged model data handlers for bookmarks to liferay-portlet.xml