Animation compression options for ModelImporter.
Compressing animations saves space in the built game, but more compression
introduces more artifacts in the animations.
See Also: ModelImporter.animationCompression.
| Off | No animation compression. | 
| KeyframeReduction | Perform keyframe reduction. | 
| KeyframeReductionAndCompression | Perform keyframe reduction and compression. | 
| Optimal | Perform keyframe reduction and choose the best animation curve representation at runtime to reduce memory footprint (default). |