Adds support for SHX file attributes.
Features
- Added support for 'ACAD_PROXY' in SHX files.
- Added support for basic saving without options.
- Improved SHX font support.
- Added support for SHX file attributes.
- You can now convert OBJ drawing to ApsScene3D.
- Added support for 'CadAttDef', 'CadAttrib', 'MINSERT', 'CadInsertObject', 'CadArcLengthDimension' and 'CadJoggedDimension' writing properties.