Add exporting for dual extruder support #127
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This change allows you to export a fill for an inset legend. This allows you to print with dual extruders, one for the keycap and one that fills the inset legend.
$output_inset_text_only
This is used to export only the fill shape of inset legends so that they can be printed in a separate colour.
$offset_x & $offset_y
3D printers set (0,0) as the bottom left of the build plate. This means that any 3mf files will be imported into your slicer on the bottom left. By setting offset_x and offset_y to the width/2 and height/2, your imported 3mf files will be centred on the build plate in your slicer.
Example of a keycap in Cura ready to print in dual colors
![image](https://user-images.githubusercontent.com/23387864/152690351-e0413e06-b33d-49ce-bb4e-a980212d1807.png)