DOCX strict import: handle charts

Change-Id: I1933b3272ff735ae1ecb500fcd693e3ca99bf264
DOCX strict import: handle SmartArt

Change-Id: I8c45f3153eafe882f3d9ee3be533c3c0e673527e
DOCX strict import: handle lockedCanvas

Change-Id: I44c936a8972e1ae101aeab62ace61f4470d92b34
DOCX strict import: handle math

Change-Id: I8b1419cb71ef67f91bfa532faa283204dae0e25c