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(to be tested).

transaction weak refs the dialog, so that is not necessary to unref when the transaction terminates.

implement transaction queue in dialog, to avoid rejecting new requests while there is pending transaction within this dialog.
remove circular references between dialog and transaction
optimize dialog matching for client transaction (avoid lookup in dialog list)

enhance nat helper mechanism so that even unchallenged requests can be immediately resubmitted by the refresher if the contact could not be properly set the first time.

reset input stream buffer each time a SIP message is parsed, and copy the remaining bytes at top of buffer

Do not crash if incoming message is received without branch in Via.