Fix Attributes with AcDbMTextObjectEmbedded fields

See the ATTRIB spec: ### 20.4.4 ATTRIB (2) Common TEXT Entity Data R2010+: Version RC ? R2018+: Attribute type RC 71 1 = Single line, 2 = Multi line (ATTRIB), 4 = Multiple line (ATTDEF) IF Attribute type is multi line MTEXT fields ... Here all fields of an embedded MTEXT object are written, starting from the Entmode (entity mode). The owner handle can be 0. For DXF this is marked with <101, Embedded Object>, Followed by the MTEXT fields, starting with the Insertion point (group 10). Annotative data size BS IF Annotative data size greater than zero Annotative data bytes RC Byte array with length Annotative data size. Registered application H Hard pointer. Unknown BS 72? Value 0. END IF Tag string VT 2 Unknown BS 73? Value 0 Flags RC 70 0 = None, 1 = Invisible, 2 = Constant, 4 = Input verification required, 8 = Preset Lock position B 280 END IF Common: IF Attribute type is single line Tag TV 2 Field length BS 73 unused Flags RC 70 NOT bit-pair-coded. R2007+: Lock position flag B 280 END IF (single line) Fix the AcDbMTextObjectEmbedded. repro `./log to/2018/from_ACadSharp/AecObjects.dwg`. There's also a converted DXF alongside. For each field in the DXF after 101 Embedded Object change it, convert via ODA to a 2018 DWG, and check the changed value and position with ./log -v6. If you see the exact position of the changed value, change the spec accordingly