DOCX import: detect table in groupshape

Change-Id: Iba7bb88139a97e919739363cd85f3e822062b694
DOCX import: detect inline shape inside shape text

Change-Id: Ia1614759558e73686fce137eb52fb623eae4a4e5
DOCX import: recurse into w:ins in groupshape text

Groupshape text is provided by editeng, redlining is available in Writer
text only. But still, instead of ignoring both deletions and insertions
in group shape text, we could at least show the latest version
correctly, i.e. ignore deletions but import insertions.

Change-Id: I12df2ca1a8d27f9496a8036e521f8820d7075053