Editor - Prototype reference piece or image

[riverwanderer]

When editing a prototype one may want to know how features relate to the image that pieces using the prototype will display. A solution is to bring a reference image in using a temporary Layer trait.

It would save time if the Editor allowed a reference piece to be assigned to the prototype, perhaps with the option to display it or not (so that one can still easily determine what the prototype is doing vs what the piece does).

If this is problematic, then perhaps a similar benefit can be obtained from just the ability to assign a reference image with a configurable offset.

This connection between a prototype and reference piece or image would only be meaningful when editing traits within a prototype. The Player would ignore this feature entirely.