LPS-31784 Move exportReferencedContent logic to DDM Data Handler (only copy-paste, no logic changes)
LPS-31784 Update journal data handler to use DDM
LPS-31784 Update calls from other handlers
LPS-31784 Update ddmStructure-uuid to ddm-structure-uuid, and ddmTemplate-uuid to ddm-template-uuid
LPS-31784 Rename portlet preference templateId to ddmTemplateKey because of LPS-31444
LPS-31784 Source formatting
LPS-31784 Use ddmStructurePath for var name
LPS-31784 Use ddmTemplatePath for var name
LPS-31784 Simplify name
LPS-31784 Fix very misleading name, especially since other parts of this class already use ddmTemplateKeys vs ddmTemplateIds
LPS-31784 Update dir from ddmStructure to ddm-structure
LPS-31784 Update other elements / language keys to be ddm-s* or ddm-t* and not ddmS* or ddmT*