feat: implement audio object definitions and refactor audio system

- Add AudioObjectDefinitions.cs with name-to-ID mappings and ambiguity detection
- Update AudioSystem.cs to support Play(uint) and deprecated Play(string) with warnings
- Rename PitchStepManager to PitchStepResolver and update all references
- Refactor generated code to use 'this.' prefix and foreach loops
- Remove TestEnum from audio enums and IDs
- Update SampleScene.unity to use new AudioSystem namespace and rain sound parameter
- Optimize binary serialization in generated audio classes

Assets/Scripts/OCES/Audio/Generated/AudioObject.cs

@@ -178,9 +178,9 @@ public partial class AudioObject : IBinarySerializable
 		else
 		{
 			writer.Write(Name.Count);
-			for (int i = 0; i < Name.Count; i++)
+			foreach (var t in Name)
 			{
-				writer.Write(Name[i]);
+				writer.Write(t);
 			}
 		}
 		writer.Write(Comment);
@@ -213,7 +213,7 @@ public partial class AudioObjectConfig : IBinarySerializable
 
 	public List<AudioObject> AudioObjectList()
 	{
-		this.m_audioObjectInfoList ??= new List<AudioObject>(m_audioObjectInfos.Values);
+		this.m_audioObjectInfoList ??= new List<AudioObject>(this.m_audioObjectInfos.Values);
 		return this.m_audioObjectInfoList;
 	}