Issue #3629152: Allow a separate Document Server address for requests from the Drupal server

Daniel Pernoldrequested to merge
issue/onlyoffice-3629152:3629152-internal-doc-server-url into 3.0.x
  • Document Server builds the URL of a saved file from the address the editor was opened under; a Drupal server that cannot reach that address could not save, and the editor reopened the document from a server backup copy
  • new optional setting doc_server_url_internal; the save callbacks of the module and of onlyoffice_form download the file through it

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