modelling: prep file

[tokejepsen]

• zeroes all models in the scene to have pivot at world zero
• applies default lambert and deletes everything else in the scene
• removes any groups, so all models are children of world
• removes any namespaces

[tokejepsen]

https://gist.github.com/tokejepsen/66103ee17e4b4978cf9c

[tokejepsen]

Checkboxes to select prep options. Radio buttons to select what to prep; selected or scene.