Allow changing of existing overlay values

Allow one of the dimensions be filled via aspect ratio

Added image overlays, these are offset and scaled photos drawn on top of the part model to help getting part data from pictures.

Fixed coordconv3_2 algorithm, plane drawing works on any of the fixed cameras now.

Added wireframe mode

Split inverting into methods into LDObject and its subclasses, fixed a rather severe memory leak issue (GL display lists weren't being removed properly)

Readded BFC red-green view, although determining inversion isn't always correct and it cannot handle CW-certified files...

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mercurial