Moved DXF export scripts to separate directory.
Extracted common functions to separate module.
Added support for recording dependencies while compiling OpenSCAD files.
Added more example files to showcase dependency tracking.
Upgraded Python files copied from the Inkscape distribution to those from version 0.91.99.13724.
Fixed DXF plugin to work with new inkex library.
Removed some unused imports in the scripts copied from the Inkscape distribution.
Rewritten unit conversion methods of inkex.py to properly handle viewport settings.
Removed some unused imports in the scripts copied from the Inkscape distribution.
Added a .gitignore file to the src directory so it will be created when cloning the repository.
Workaround for OpenSCAD sometimes writing an empty STL file when it crashes.