Added possibility to register callback function when entity has been created/deleted.

If scenario domain entities are having references to the same IEntity, it might be that another instance is deleting this IEntity invalidating all references pointing to it. Those situations could be handled using the callback mechanism.

Signed-off-by: Jupp Tscheak <jupp.tscheak@daimler.com>

MantleAPI/include/MantleAPI/Traffic/i_entity_repository.h

@@ -45,6 +45,9 @@ class IEntityRepository
     virtual void Delete(UniqueId id) = 0;
 
     virtual const std::vector<std::unique_ptr<mantle_api::IEntity>>& GetEntities() const = 0;
+
+    virtual void RegisterEntityCreatedCallback(const std::function<void(IEntity&)>& callback) = 0;
+    virtual void RegisterEntityDeletedCallback(const std::function<void(const std::string&)>& callback) = 0;
 };
 
 }  // namespace mantle_api