* Refactored the whole audaspace library to use float as sample format over all readers.
* Added new Readers like the linear resampler, envelope, lowpass, highpass and butterworth.
* Note: The butterworth filter isn't working correctly, some bug in there... Maybe also true for the envelope.
* Added a sound to f-curve operator that behaves mostly like the soundtracker script of technoestupido.
I hoped for it to resolve the bug of loading sounds with relative paths didn't work, but Main.name isn't set before the sounds are loaded, so the bug resists!
Someone who is into file loading should please fix this!
