audio: 3D audio source / listener (!55) · Merge requests · gamedev / age / libraries · GitLab

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This MR introduces a concept of 3D audio into age.

New 3D audio source and listener
2D audio source got rewritten into a folder to maintain common interface between sources
- Concrete playback functionality was moved into a separate VFS file that both sources utilize
Linear and exponential attenuation
Amplitude panning (for now just stereo)