Add --detach. Add multi-pass flag parsing that lets us get things in the right order.

adsbus/Makefile

@@ -10,7 +10,7 @@ VALGRIND ?= valgrind
 VALGRIND_FLAGS ?= --error-exitcode=1 --trace-children=yes --track-fds=yes --show-leak-kinds=all --leak-check=full
 ADSBUS_TEST_FLAGS ?= --stdin --stdout=airspy_adsb --stdout=beast --stdout=json --stdout=proto --stdout=raw --stdout=stats
 
-OBJ_TRANSPORT = exec.o file.o incoming.o outgoing.o
+OBJ_TRANSPORT = exec.o file.o incoming.o outgoing.o stdinout.o
 OBJ_FLOW = flow.o receive.o send.o send_receive.o
 OBJ_PROTOCOL = airspy_adsb.o beast.o json.o proto.o raw.o stats.o
 OBJ_UTIL = asyncaddrinfo.o buf.o hex.o list.o log.o opts.o packet.o peer.o rand.o resolve.o server.o socket.o uuid.o wakeup.o