Web-audio-api

- Implemented context.decodeAudioData
- New media decoder using symphonia crate (with MP3 support)
- WaveShaper fixes
- Spec compliance: float for sample rate, thread safe nodes, naming of nodes

- Support cyclic audio graphs with DelayNode acting as cycle breaker
- Greatly improved AudioBufferSourceNode (sub quantum scheduling, more
controls, performance)
- Added cone gain functionality for PannerNode
- Improved performance of audio graph rendering

- Support all AudioParam automation methods
- Change AudioProcessor API to match spec better

- Support AudioParam.exponentialRampToValueAtTime
- Fix runaway memory and CPU usage due to unreleased nodes from graph

- Added IirFilterNode
- Added AudioContextOptions
- Support more audio mixing modes

- Added WaveShaperNode
- Added StereoPannerNode