Migrate to Kitodo.Presentation 4

[dvoracek-slub]

This PR attempts to finish the migration to Kitodo.Presentation 4 and Extbase/Fluid, and does some maintenance and fixes along the way. When merged, this resolves #201 and #205.

The migration relies on the following PRs to other repos:

• [FEATURE] In calendar, fall back to METS if DB is empty kitodo/kitodo-presentation#844
  (Needed to replace the custom calendar plugin)
• Fix display and conditions of PDF download link slub_digitalcollections#47

So to test this:

• Checkout the Kitodo and Digital Collections PRs. (There's also https://github.com/dvoracek-slub/kitodo-presentation/tree/dev-dfgviewer.)
• Migrate to Kitodo.Presentation 4 ddev-dfgviewer#2 is an update to the default DDEV system.
• https://github.com/dvoracek-slub/ddev-dfgviewer-dist/ may be used to easily test a clean install.

Questions:

• language.typoscript has a language condition that looks obsolete to me (when using website language and site configuration). Is this right?
• How should localization of metadata labels and structures be handled?
  In principle, they would work if the following is done:
  • Create a translation of the viewer page.
    • If we want to include it in the initialization data dump, we could probably add it manually. (The impexp extension doesn't export page translations as of 10.4, see https://forge.typo3.org/issues/93470.)
    • Alternatively, we can just add a remark in the documentation to do this after install if wanted.
  • Remove the 0 suffixes of column index_name in tables tx_dlf_metadata and tx_dlf_structures.
    • I tried to change data.xml to avoid these suffixes on fresh install, but couldn't find a way so far. Even when reordering the entries, it looks like TYPO3's DataHandler::getUnique() won't detect the translated records as such because the l18n_parent doesn't yet have an ID.
    • What does seem to work is an SQL query like the following. This could possibly be integrated into the Kitodo backend module or documented.

      UPDATE `tx_dlf_metadata` a
      INNER JOIN `tx_dlf_metadata` b
      ON (a.l18n_parent = b.uid OR a.uid = b.l18n_parent)
      SET a.index_name = b.index_name
      WHERE a.index_name LIKE CONCAT(b.index_name, '0');
      
      UPDATE `tx_dlf_structures` a
      INNER JOIN `tx_dlf_structures` b
      ON (a.l18n_parent = b.uid OR a.uid = b.l18n_parent)
      SET a.index_name = b.index_name
      WHERE a.index_name LIKE CONCAT(b.index_name, '0');