oxml: convert CT_GraphicalObject to xmlchemy
oxml: convert CT_GraphicalObject to xmlchemy

holli-holzer/python-docx,eruffaldi/python-docx,jean/python-docx,Nuos/python-docx,python-openxml/python-docx,guilhermebr/python-docx,SimplyAgree/python-docx,yurac/python-docx,mohamedattahri/python-docx,tanyunshi/python-docx