Refactored IDocumentListsAccess out of SwDoc.

In the new class DocumentListsManager.
The method listfunc::CreateUniqueListId was also moved there.
Added a new method deleteListsByDefaultListStyle to the Interface,
which is needed for SwDoc::DelNumRule.

Change-Id: I75ea554a57d9402d2fcfeaedf9fbe50fbae2b020