Implement java.lang.Object native methods

[lucasbaizer]

Native method: java/lang/Object.registerNatives()V
Native method: java/lang/Object.getClass()Ljava/lang/Class;
Native method: java/lang/Object.hashCode()I
Native method: java/lang/Object.clone()Ljava/lang/Object;
Native method: java/lang/Object.notify()V
Native method: java/lang/Object.notifyAll()V
Native method: java/lang/Object.wait(J)V