High quality resampling on mixdown, linear for playback. * Lots of improvements and fixes for the JOS resampler, now it works fine! * High quality filter coefficients for the JOS resampler (sorry for the 5 MB source file). * Fix for GE orientation bug. Note: moto uses x,y,z,w quaternion storage, while rest of blender uses w,x,y,z. * Minor changes/fixes.