Issue #179: Support export pattern to DXF. (dismine/valentina)

New issue 179: Support export pattern to DXF.

Roman Telezhinskyi:

AutoCAD DXF (Drawing Interchange Format, or Drawing Exchange Format) is a CAD data file format developed by Autodesk for enabling data interoperability between AutoCAD and other programs.

Useful links:

By using Qt Paint System we can easy to add support for DXF files. Main issue is understand how dxf work.

Responsible: dismi_