DXF output for 2d models

changes

• Support for DXF output for 2d models
• Improved 2d tesselator

binaries

xcsg-1.0-04-ubuntu-16.04.3-lts.zip
xcsg-1.0-04-ubuntu-17.04.zip
xcsg-1.0-04-windows-x86_64.zip

Binaries tested for Windows, Kubuntu and Ubuntu. Download the file matching your OS.
For Ubuntu the zip files contain *.deb files.