New frame attribute: TextVerticalAdjust <-> RES_TEXT_VERT_ADJUST

By now this property is added for MS Word interoperability.
With it we can make DOCX import/export working.
I use this solution instead of InteropGrabBag because vertical
adjustment would be a good thing to have for text frames too.
So later it can be the first step of an enhanchement.

Change-Id: I9dcfdc8ae56ce443f0c286c51136e1d006951938
drawingML export/import: text frames with vertical alignment

Change-Id: I469da0a8234dd2979facfed3d66907aad1a138ab
ODF export/import: text vertical adjustment attribute of text frames

ODF standard handle 'textarea-vertical-align' as a
'graphic-property' which "specifies formatting
properties for chart, draw, graphic, and frame elements".
So this change fit to the standard.

Change-Id: I956f512953380983c2c882e943178335fd4dbfeb
drawingML: remove code duplication: use WriteStretch()

Change-Id: I0d589da01bf6afed86b5811d6b27f72f6e1bb160
drawingML: remove code duplication: use GetRelativeRect()

Change-Id: I7368ad15292c82e5320deb9ab60e04f70d0c92b8