[osg-submissions] Inventor Writer

[PCJohn]

Hi Robert,

in the company, we developed writer to two file formats:
- Inventor
- VRML1

I tested it on several models from OSG package and it seems to work well 
on the most of models.

I am submitting it for inclusion into the OSG.
I just zipped changed files from src/osgPlugins/Inventor directory.

Feel free to send me comments on problematic models (if you find any) or 
compiling problems (I tested on MSVC 2003 only).

Feedback from people using SGI Inventor is also welcomed. Just send me 
your problems. Thanks for them.

Just one question:
I noticed collision between VRML 1 and VRML 2 (VRML97) file formats,
because both of them are using the same file extension (wrl).
VRML 2 is successor of VRML 1, however it is not compatible with it.
They can be distinguished by the header - first line in the file - and 
whole family of this formats is using this header approach instead of 
file extensions.
Therefore, it would be difficult for an user to specify, which format he 
wants. (I prefer VRML 1, however, if both VRML 1/2 plugins exists, 
people may receive files in random formats.)

Hope, the community will be happy with the new writer.
John
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