* Added more interpolation methods to in_ncsf.
* Cleaned up a little of the code in the Interpolate function in in_ncsf.
* Made it so changes in the config can apply to a running song, depending on the player.
* Slight optimization of in_ncsf's interpolation so it doesn't have as much std::vector accessing.
* Stopped trying to use the slope of the points to determine points outside the sample's range, hopefully will stop some of the clipping.