Make most of the battle library use unique_ptr.

src/Battling/ScriptHandling/ScriptResolver.hpp

@@ -14,7 +14,7 @@ namespace CreatureLib::Battling {
         virtual ~ScriptResolver() = default;
 
         virtual void Initialize(BattleLibrary* library){};
-        virtual Script* LoadScript(ScriptCategory category, const ConstString& scriptName) { return nullptr; };
+        virtual Script* LoadScript(ScriptCategory category, const ConstString& scriptName) const { return nullptr; };
     };
 }