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quic-conn layer has to handle itself STREAM frames after MUX release. If the stream was already seen, it is probably only a retransmitted frame which can be safely ignored. For other streams, an active closure may be needed. Thus it's necessary that quic-conn layer knows the highest stream ID already handled by the MUX after its release. Previously, this was done via <nb_streams> member array in quic-conn structure. Refactor this by replacing <nb_streams> by two members called <stream_max_uni>/<stream_max_bidi>. Indeed, it is unnecessary for quic-conn layer to monitor locally opened uni streams, as the peer cannot by definition emit a STREAM frame on it. Also, bidirectional streams are always opened by the remote side. Previously, <nb_streams> were set by quic-stream layer. Now, <stream_max_uni>/<stream_max_bidi> members are only set one time, just prior to QUIC MUX release. This is sufficient as quic-conn do not use them if the MUX is available. Note that previously, IDs were used relatively to their type, thus incremented by 1, after shifting the original value. For simplification, use the plain stream ID, which is incremented by 4.