Dequeueus a message as array of Byte. 
Class
TOraQueue
 Syntax
function Dequeue(out Payload: TBytes; MessageProperties: TQueueMessageProperties = nil; DequeueOptions: TDequeueOptions = nil): TMessageId; overload;
Parameters
Payload
Holds the message content as array of Byte. 
MessageProperties
Holds the properties of a message that will be dequeued. 
DequeueOptions
Holds the options for dequeueing messages. 
Return Value
message ID as string.