New implementation for extruded custom shapes

[Regina Henschel <rb.henschel@xxxxxxxxxxx>]

Hi all,

The current solution for extruded custom shapes is only suitable for 
shapes from binary MS Office files. Even not all features of ODF are 
implemented. And there are no ways at all to display modern 3D objects 
from OOXML.

Would anyone like to implement a new version for extruded custom shapes 
together with me?

Kind regards,
Regina