Added password support for documents.

Change-Id: Ifd9cf86894ddaf2fd5ad97510d2ac1b5850611ad
Reviewed-on: https://gerrit.libreoffice.org/40458Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
Tested-by: Tomaž Vajngerl <quikee@gmail.com>