…tructure accordingly

The Metadata object can now hold entry nodes with a new array containing all subentries.
These are fetched from the subentries table.

* Updated the domain model and repositories to comply with the new DB structure.
* Cleaned up all references to the old table name 'tx_dlf_metadata_subentries'.
* Make 'tx_dlf_metadatasubentries' table accessible for some functions in Hooks/Helper class.
* Extbase class mappings have to be hold as TypoScript _and_ PHP config as long as TYPO3 9 support is not dropped.

In addition, create empty repository class to comply with Extbase conventions.

Required for TYPO3 9.5 support.

Also provided IsArrayViewHelper and respect sub-arrays when building $metaCObjData.

Add a TypoScript Wrap field for subentries in database and TCA.

When XPath functions like concat() are used, evaluate() returns a string instead of a DOMNodeList.

…subentry

# Conflicts:
#	Classes/Common/Indexer.php
#	Classes/Common/MetsDocument.php
#	Classes/Domain/Model/MetadataFormat.php
#	Configuration/TCA/tx_dlf_metadataformat.php
#	Resources/Private/Partials/Metadata/Entries.html
#	ext_typoscript_setup.txt