[BUGFIX] Invalid relations of IRRE records in workspaces

* general -> always use live id as pointer value
* create records -> automatically fill placeholder pointers
* copy records -> currently leads to problems with sorting
* move records -> follow and create child move placeholders
* delete records -> forward delete data in copy(!) process
* ReferenceIndex needs to hold the most specific relations
  since the CommandMap handler is based on this information
* ReleationHandler is extended for IRRE references to fetch
  the live default parent pointer automatically (this new
  behaviour can be disabled by public methods for each
  RelationHandler instance)
* The method version_swap_procBasedOnFieldType of the version
  DataHandlerHook is completely removed since IRRE records are
  now referenced using the live default parent pointer value
* UserTSconfig property options.workspaces.swapMode is set
  to "pages" per default - thus, if a page gets published all
  accordant records on that page are published as well

Resolves: #56376
Releases: 6.2
Change-Id: I75248d10b000de73ca623770f07e8c2e89d4cdd8