• [FEATURE] QUIC and HTTP/3 Internet Draft 29 support.
• [BUGFIX] Check that scheduled packets are also sendable when calculating a connection's "tickable" property.
• [BUGFIX] Don't count scheduled packets as in-flight when pacer is checked on tick.
• gQUIC: delay calling on_new for pushed stream until headers are available.
• Allow nested calls to lsquic_engine_connect().