Validation support for X3D4 advanced audio nodes

[brutzman]

Need validation support for X3D4 advanced audio nodes. Even if the node functionality is not yet implemented, their presence in a model does not need to throw a validation error. Node list and reference links follow.

AcousticProperties Analyser AudioDestination BiquadFilter BufferAudioSource ChannelMerger ChannelSelector ChannelSplitter Convolver Delay DynamicsCompressor Gain ListenerPointSource MicrophoneSource OscillatorSource PeriodicWave SpatialSound StreamAudioDestination StreamAudioSource WaveShaper

• https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-IS.proof/Part01/components/sound.html
• https://www.web3d.org/specifications/X3Dv4Draft/ISO-IEC19775-1v4-IS.proof/Part01/components/shape.html#AcousticProperties

Example scene (in various formats) for testing found at

• https://www.web3d.org/x3d/content/examples/X3dForAdvancedModeling/AudioSpatialSound/AllAudioGraphNodesTestIndex.html

[michaliskambi]

Yes, agreed (regardless of support for full functionality, which may take time, we need to at least parse and validate the nodes). This is duplicate in castle-engine/castle-model-viewer#80 (but that's an issue in technically another project, so I'm fine with duplicate :) ).