[osg-submissions] Hardware mipmap support for Texture3D

[Farshid Lashkari]

Hi Robert,

I've added hardware mipmap support to Texture3D. We are still using
OSG 1.2 here, so I have not been able to test my changes with the
latest release. I did download the latest version of Texture3D.cpp and
merged my changes into it, so the attached file should be up to date.

Cheers,
Farshid
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