Refactored IDocumentFieldsAccess out of SwDoc.

Into the new class DocumentFieldsManager.
Removed SwDoc::_MakeFldList because it is not defined anywhere.
Also moved a few non interface methods that belong to the manager.

Change-Id: Icefd7ca7adcbb05a18d6fae0529fc54150b862fd
Refactored IDocumentLineNumberAccess.

This interface is obsolete and was deleted.

Change-Id: I56d37814f6e43f083ab3d199237ade06db287e18
Refactored IDocumentStatistics our of SwDoc.

Into the new class DocumentStatisticsManager.

Change-Id: I281232dc09dbd79c2faf3c2a78ae49625bbe88ee
Refactored IDocumentState out of SwDoc.

Into the new class DocumentStateManager.

Change-Id: I91c9097b091ff6118d58fd15fff2a4cefe0171fd
Refactored IDocumentLayoutAccess out of SwDoc.

Into the new class DocumentLayoutManager.

Change-Id: I02d0cfcc63633d0bdab380508b2ef563187fd269
Refactored IDocumentStylePoolAccess out of SwDoc.

Added non const SwDoc::GetDfltTxtFmtColl and SwDoc::GetTxtFmtColls
and SwDoc::GetCharFmts.
Had to make the manager friend of SwTxtFmtColl and SwConditionTxtFmtColl
Had to make SwDoc::_MakeCharFmt and SwDoc::_MakeFrmFmt public.

Change-Id: I19a36d91f92b3781a6c4313ec12eb8f7d4dfacc3
Refactored IDocumentExternalData out of SwDoc.

Into the new class DocumentExternalDataManager.

Change-Id: Ib863daec170044c46143b47a91739d4c0940d963