message: Fix Gltfio.init(): call Filament.init() as well
diff: package com.google.android.filament.gltfio;
  +import com.google.android.filament.Filament;
  +
  public class Gltfio {
  /**
  * Initializes the gltfio JNI layer. Must be called before using any gltfio functionality.
  */
  public static void init() {
  + // Load Filament first to ensure that the NioUtils Java class is available in the JNIEnv.
  + Filament.init();
  System.loadLibrary("gltfio-jni");
  }
  }
  