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qc_stream_desc is an intermediary layer between QUIC MUX and quic_conn. It is a facility which permits to store data to emit and keep them for retransmission until acknowledgment. This layer is responsible to notify QUIC MUX each time a buffer is freed. This is necessary as MUX buffer allocation is limited by the underlying congestion window size. Refactor this to use a mechanism similar to send notification. A new callback notify_room can now be registered to qc_stream_desc instance. This is set by QUIC MUX to qmux_ctrl_room(). On MUX QUIC free, special care is now taken to reset notify_room callback to NULL. Thanks to this refactoring, further adjustment have been made to refine the architecture. One of them is the removal of qc_stream_desc QC_SD_FL_OOB_BUF, which is now converted to a MUX layer flag QC_SF_TXBUF_OOB.