bd6ca0570e
Implemented basic audio animation. * AnimatableProperty: Propper cache writing and spline interpolation for reading (the solution for stair steps in audio animation) * Animatable properties so far are: volume, pitch, panning * Users note: Changing the pitch of a sound results in wrong seeking, due to the resulting playback length difference. * Users note: Panning only works for mono sources, values are in the range [-2..2], this basically controls the angle of the sound, 0 is front, -1 left, 1 right and 2 and -2 are back. Typical stereo panning only supports [-1..1]. * Disabled animation of audio related ffmpeg output parameters. * Scene Audio Panel: 3D Listener settings also for Renderer, new Volume property (animatable!), Update/Bake buttons for animation problems, moved sampling rate and channel count here