Navigator update: better conversion to behaviors, better property editing, better version control, and send to private commands

[Geoff Canyon]

The update is now available here
<https://www.dropbox.com/s/bcqxxriwzzjcm45/navigator_5.zip?dl=1>. I haven't
updated the documentation yet. The main changes are:

1. The whole convert-to-behaviors and restore-from-behaviors bit has been
moved to its own custom palette, opened from Navigator. This makes the
whole process much clearer, and setting the options is easier and more
forgiving.
2. There's a preview for the naming template process -- again, easier and
more foolproof, and a dropdown offers some pre-made options.
3. The dialog's working list is derived from the selection in Navigator
when the command is issued, but it's text -- anything can be modified,
deleted, or added before processing.
4. There is a button to add enclosed objects. So it's possible to select a
group, card, or stack in Navigator, select the command, and then add
enclosed objects to include all the controls in that container -- or
containers, it processes everything in the list.
5. There is a button to add behavior chains, so it's possible to select one
control that has a chain of fifty behaviors, and click the button to add
them all to the list to be processed.
6. Both Convert and Restore have a preview option -- use it and the
resulting log will show exactly what will be done, without actually doing
any of it.

gc