drawingml import: read w:sdtContent

Change-Id: I691b0ee28304659fedbe9cf8eff6ba1d757d0803
drawingml import: read w:rPr

Change-Id: I4405f9bc073b6e0b8c0426561ae9d01d91efdd59
drawingml import: read w:sz

Change-Id: I40293a0b612b50d5da3d736f567310525608b308
drawingml import: read w:color

Change-Id: I6ae7ea8b58e262e5b6226f8f789e39ebcc6077ca