Expose a bit more information about needed file in REST interface

cmd/syncthing/gui.go

@@ -121,10 +121,14 @@ func (f guiFile) MarshalJSON() ([]byte, error) {
 	type t struct {
 		Name     string
 		Size     int64
+		Modified int64
+		Flags    uint32
 	}
 	return json.Marshal(t{
 		Name:     f.Name,
 		Size:     scanner.File(f).Size,
+		Modified: f.Modified,
+		Flags:    f.Flags,
 	})
 }