contractcourt+switch: keep channels with timed-out initiated htlcs.

This commit enables the user to specify he is not interested in
automatically close channels with pending payments that their
corresponding htlcs have timed-out.
By requiring a configurable grace period uptime of our node
before closing such channels, we give a chance to the other node to
properly cancel the htlc and avoid unnecessary on-chain transaction.
In mobile it is very important for the user experience as otherwise
channels will be force closed more frequently.

server.go

@@ -915,11 +915,14 @@ func newServer(listenAddrs []net.Addr, chanDB *channeldb.DB,
 				return ErrServerShuttingDown
 			}
 		},
-		DisableChannel:      s.chanStatusMgr.RequestDisable,
-		Sweeper:             s.sweeper,
-		Registry:            s.invoices,
-		NotifyClosedChannel: s.channelNotifier.NotifyClosedChannelEvent,
-		OnionProcessor:      s.sphinx,
+		DisableChannel:                s.chanStatusMgr.RequestDisable,
+		Sweeper:                       s.sweeper,
+		Registry:                      s.invoices,
+		NotifyClosedChannel:           s.channelNotifier.NotifyClosedChannelEvent,
+		OnionProcessor:                s.sphinx,
+		PaymentsExpirationGracePeriod: cfg.PaymentsExpirationGracePeriod,
+		IsForwardedHTLC:               s.htlcSwitch.IsForwardedHTLC,
+		Clock:                         clock.NewDefaultClock(),
 	}, chanDB)
 
 	s.breachArbiter = newBreachArbiter(&BreachConfig{