Initial Steam Audio SDK Release

This is the initial release of Steam Audio SDK. Changes from Phonon 1.7 to Steam Audio SDK 2.0 Beta 1 include:

• Unified solution for 3D audio, real-time propagation, and baked propagation.
• Available as a Unity plugin and C API; additional integrations under development.
• Support for raycast and partial occlusion of direct sound.
• Quality improvements to 3D audio (previously called Phonon 3D), reducing frequency coloration of audio clips when spatialized.
• Support for Ambisonics based 3D audio for sound propagation.
• Performance improvements for real-time sound propagation.
• Increased flexibility in specifying how and where reverb is baked (previously called Phonon Reverb).
• Support for direction-dependent reverb, using Ambisonics.
• Support for baking per-sound sound propagation effect (previously called Phonon SoundFlow).
• Support for baking sound propagation effect for static listener.
• (Unity plugin) Performance improvements for scene export.