Blender 2.5 export script, work in progress.
Blender 2.5 export script, work in progress.

- new settings: export emitting objects as mesh lights, point lights diameter.
- added missing descriptions to existing settings.
- hackish handling of the Fresnel factor.
- don't normalize BSDF weights if they sum up to less than 1.
- use the mirror color when exporting a purely specular BRDF.

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