Make Battle fields protected instead of private.

src/Battling/Models/Battle.hpp

@@ -17,6 +17,7 @@ using namespace Arbutils::Collections;
 
 namespace CreatureLib::Battling {
     class Battle : public ScriptSource {
+    protected:
         const BattleLibrary* _library;
         List<BattleParty*> _parties;
         bool _canFlee;