[Nel] Exposing shapes

[Loic Dachary]

        Hi,

        I'm about to create nel/3d/u_shape.h + associated files (based
on u_light for instance) to publish the serial function that will
allow the python interface to read/write .shape files. I'm aware of
the fact that "class CShapeStream" as found in nel/src/3d/shape.c does
this (more or less).

        Please let me know if you think that's a silly idea for
some reason.

        Cheers,

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