DOCX import: declare wps as a supported feature

This means in case we hit an mc:AlternateContent element, we will read
the mc:Choice branch of it, in case wps is the required feature, not the
mc:Fallback one, which contains the information in VML format (after a
lossy conversion).

Change-Id: I476156bd1a39927dda903d14540155d1e62a211e
DOCX drawingML groupshape import: fix relative position

Change-Id: Ice07f423707b48a013a9b6325b11f88206c38e60