Blender Git Loki

Added separate functions to get curve data for sampling and keyframes

For Materials, Camera, Lamp actions it turned out that the sampler
can not sample the data at the moment. So for those curves i need
to get the data from the original curves for now. I Added a getter
that would retreive the data from the FCurve instead from the sampled
data if no sampled data is available. This will change (wip)

Known limitation: the Material,Lamp,Camera actions are always
exported with linear interpolation (wip)