Inkscape 3D-printer gcode plugin

This is a continuation of the inkscape-unicorn plugin. It allows you to draw different layers, which the 3d printer will print and put on top of each other.
This thing is very much a work in progress. I intend to parse the style properly, so I can assign differentiate between different colours and produce gcode for multi-nozzle setups, and interpret the stoke-width as a measure for the track-width. In the end it should be very much what you see on screen is what you get on the printer.
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