Array of paths to the root assets to include in the build.
Set this property to project-relative paths of existing ScriptableObject-derived assets. The build
includes each specified asset along with any dependency it references. After you register the content directory, retrieve
the root assets at runtime with ContentLoadManager.GetRootAssets.
Only ScriptableObject-derived assets are permitted as roots, to prevent accidental misuse such as using large assets
like Textures or Meshes as root assets.
Additional resources: ContentLoadManager.GetRootAssets