MEDIUM: mux-quic: remove qcs tree node

The new qc_stream_desc type has a tree node for storage. Thus, we can
remove the node in the qcs structure.

When initializing a new stream, it is stored into the qcc streams_by_id
tree. When the MUX releases it, it will freed as soon as its buffer is
emptied. Before this, the quic-conn is responsible to store it inside
its own streams_by_id tree.
6 files changed