Getting in line with blenders addon design philosophy
All data for paper model editing is now stored in custom properties of Mesh objects.
Operators can instantiate a paper model object from an active meshes properties, perform operations on the model and write back to Mesh properties when finished.
Removed most python globals (except some handles for rendering)
Removed the modal Zamboni editing mode operator. Editing the paper model can now be done directly in mesh edit mode.
Added an operator that removes all automatically generated cuts (replacing the auto cuts toggle).