Blender Git Loki

Refactor Collada: Removed obsolete BCKeyPoint class

Also simplified the way how the AnimationSampler
stores its sampled data.

After some experimenting i decided to use FCurves as
intermediate storage for exported animation curves.
This looks a lot cleaner to me now because now i no
longer have duplicate storage locations.
Also the handling of curve handles is now pretty much straight
forward and no longer needs any extra calculations.