@Override
    public Class<? extends AssetProcessor> getProcessorType() {
        return CloneableAssetProcessor.class;
    }
Used for loading {@link Material materials} only (not material definitions!).
Material instances use cloneable smart asset management so that they and any
referenced textures will be collected when all instances of the material
become unreachable.

@author Kirill Vainer
jme3-core/src/main/java/com/jme3/asset/MaterialKey.java