Add trash can file versioning (fixes #1931)

cmd/syncthing/main.go

@@ -589,6 +589,7 @@ func syncthingMain() {
 
 	m := model.NewModel(cfg, myID, myName, "syncthing", Version, ldb)
 	cfg.Subscribe(m)
+	mainSvc.Add(m)
 
 	if t := os.Getenv("STDEADLOCKTIMEOUT"); len(t) > 0 {
 		it, err := strconv.Atoi(t)