oox: move lcl_GetPresetGeometry to msfilter, so filter can use it

Change-Id: Ia741d392a87eaa2f02615a6c9626417a420f205c
msfilter: add a drawingML -> VML map

This can be used later for the VML or binary export of shapes imported
from drawingML. Note that without this, drawingML shapes won't be
exported to VML, as e.g. for a triangle it expects a
'isosceles-triangle' type, while the shype's type is 'ooxml-triangle'.

Change-Id: I59abc27febdd026c181a7ff38b16c93567058cb9