[osg-submissions] Fixes to the OpenVRML plugin

[Jan Ciger]

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Hello,

I am attaching an improved version of the OpenVRML plugin. It still uses
OpenVRML 0.14.3 and is without the Boost dependency.

The changes:
- - Fixed loading of textures and normals when no corresponding indices
are specified. It uses vertex indices now, compliant with the VRML spec.
- - Added colour per vertex support.
- - Added group node support.
- - Changed the code to use osg::ref_ptr instead of naked pointers to
avoid memory leaks.
- - Fixed breakage for loading files specified by relative path.


It is tested and works on Linux, however I didn't test it on Windows.

Regards,

Jan
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