rem: hasLargeIcon(true), largeIcon(largeIcon)
add: hasLargeIcon(false), largeIcon(false)
context: 	NotificationMessage(int32 which, string type, string extraType,						bool largeIcon)		: which(which), type(type), hasExtraType(true), extraType(extraType),		  hasLargeIcon(true), largeIcon(largeIcon)	{	}