Add more random-number noise collection calls.

Mostly on the Unix side: there are lots of places the Windows code was
collecting noise that the corresponding Unix/GTK code wasn't bothering
to, such as mouse movements, keystrokes and various network events.
Also, both platforms had forgotten to collect noise when reading data
from a pipe to a local proxy process, even though in that
configuration that's morally equivalent to the network packet timings
that we'd normally be collecting from.

windows/winhandl.c

@@ -689,6 +689,7 @@ void handle_got_event(HANDLE event)
 	    h->u.o.sentdata(h, -h->u.o.writeerr);
 	} else {
 	    bufchain_consume(&h->u.o.queued_data, h->u.o.lenwritten);
+            noise_ultralight(h->u.o.lenwritten);
 	    h->u.o.sentdata(h, bufchain_size(&h->u.o.queued_data));
 	    handle_try_output(&h->u.o);
 	}