IOnlineTurnBased::RegisterTurnBasedMatchInterfaceObject

Accessors referring to an object that inherits from [UTurnBasedMatchInterface](API\Plugins\OnlineSubsystem\Interfaces\UTurnBasedMatchInterface) that acts like an [FTurnBasedEventDelegate](API\Plugins\OnlineSubsystem\Interfaces\FTurnBasedEventDelegate) (needed for blueprints)