This changes the following defaults:
- Render settings:
* Samples: 100
* Preview Samples: 50
* Filter: Blackmann-Harris
* Tile Order: Hilbert Spiral
- Lamp settings:
* Use MIS: On
- Material settings:
* Volume Sampling: Multiple Importance
Old files are not affected, I tested the versioning code back and forth.
More changes are to come (World, BVH...) but that needs a bit more work.
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