writerfilter: move payload from rtf to ooxml namespace

Change-Id: I7f39d0245fe9ad0aec4b8c1dcea8c379124d2d7a
DocxAttributeOutput: factor out writeDMLTextFrame() into DocxSdrExport

Also move the related m_pBodyPrAttrList and m_bDMLTextFrameSyntax
members as well.

Change-Id: I5c9f5b07b472efc930878ee2a26224346f036600
writerfilter: whitespace fixes in LatentStyleHandler

Change-Id: Ia90bdec8416be387f4d59f8c824c274ad7bb6fa0