Compilation fix for XE2. Forced, clean socket disconnect. Resolve AV when StompUtils.CreateFrame hides STOMP exceptions and returns nil such exception may be caused by sending UNICODE message via rabbitMQ console (Publish message with text "юникод")

[tomashevski]

1. Compilation fix for XE2 (IFEND-vs-ENDIF)
2. Forced, clean socket disconnect. Stompclient doesn't publish its IP connection to client app, so in case of errors stompclient must handle timeout and other connection problem by itself.
3. Resolve AV when StompUtils.CreateFrame hides STOMP exceptions and returns nil such exception may be caused by sending UNICODE message via rabbitMQ console (Publish message with text "юникод")

[danieleteti]

Sorry, can you reapply your changes to the master? There are too much changes since your PR.