Security token id

[artfire52]

According to the specification, the secure token id is:

A unique identifier for the SecureChannel SecurityToken used to secure the Message.
This identifier is returned by the Server in an OpenSecureChannel response Message.
If a Server receives a TokenId which it does not recognize it shall return an appropriate
transport layer error.

Except that we are able to change it without the server return the appropriate error.
I modified this field for the message useful to create and active session and both were accepted.

commit: fd38c64
commit date: Sat Nov 5 21:49:43 2022 +0100
application tested: demo-server