v0.23.0 color, presets, certificates made at startup, cli.go, sink flush

doc/operations.md

@@ -17,8 +17,10 @@ lw exits on its own only at the end of input: once every pipeline has
 finished, a pipeline finishing when all its sources have ended. Only a console
 source ends, when stdin does; file and network sources run until a signal, and
 lw shuts down gracefully, exit 0, either way.
-Console and file sinks write what is queued before the exit; the `http` and
-`tcp` sinks do not yet flush their clients' queues ([To Do](todo.md)). See
+Every sink writes what is queued before the exit; the `http` and `tcp` sinks
+give each client `write_timeout_ms`, at most 2 s, to take it. A reload stops
+the old sinks the same way, so a client that stopped reading delays it by
+that much. See
 [CLI](cli.md#built-in-defaults).
 
 There is no built-in daemon mode. Run LogWisp in the foreground under a