Array of paths to the root Assets that should be included in the build.
This property should contain project-relative paths to existing ScriptableObject-derived Assets. Each specified Asset will be included in the build, and available for direct load. Any dependency referenced from the Asset will also be included in the build. Root assets are automatically loaded when a Content Directory is registered, so only ScriptableObject-derived assets are permitted to prevent accidental misuse (such as attempting to use large assets like Textures or Meshes as root assets).