HTTP/QUIC interface reworked. - events handling moved into src/event/ngx_event_quic.c - http invokes once ngx_quic_run() and passes stream callback (diff to original http_request.c is now minimal) - streams are stored in rbtree using ID as a key - when a new stream is registered, appropriate callback is called - ngx_quic_stream_t type represents STREAM and stored in c->qs