release 5.16

• project going into super low maintenance mode, I don't plan on working on it any longer unless nasty bugs are reported.
• properties can now be a streaming generator too
• loopCondition is relayed from start_ns_loop() to its daemon
• removed Python 3.8 and 3.9 from the support list (they are EOL). Now supported on Python 3.10 or newer.
• docs: clarify @expose on a class not automatically exposing base class(es).