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Previous commit implement a refactor of MUX send notification from quic_conn layer. With this new architecture, a proper callback is defined for each qc_stream_desc instance. This architecture change allows to simplify notification from quic_conn layer. First, ensure the MUX callback to properly ignore retransmission of an already emitted frame. Luckily, this can be handled easily by comparing offsets and FIN status. Also, each QCS instance can now be unregistered from send notification just prior qc_stream_desc releasing. This ensures a QCS is never manipulated from quic_conn after its emission ending. Both these changes render the send notification more robust. As a nice effect, flag QUIC_FL_CONN_TX_MUX_CONTEXT can be removed as it is now unneeded.