private static void addRemapping(String oldClass, Class<? extends Savable> newClass) {
        CLASS_REMAPPINGS.put(oldClass, newClass.getName());
    }
<code>SavableClassUtil</code> contains various utilities to handle
Savable classes. The methods are general enough to not be specific to any
particular implementation.
Currently it will remap any classes from old paths to new paths
so that old J3O models can still be loaded.

@author mpowell
@author Kirill Vainer
jme3-core/src/main/java/com/jme3/export/SavableClassUtil.java