[tor-bugs] #31625 [Core Tor/Tor]: config refactoring: fix hierarchy of configuration variable flags

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#31625: config refactoring: fix hierarchy of configuration variable flags
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     Reporter:  nickm         |      Owner:  nickm
         Type:  defect        |     Status:  assigned
     Priority:  Medium        |  Milestone:  Tor: 0.4.2.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  network-team-roadmap-august
Actual Points:                |  Parent ID:  #29211
       Points:  .5            |   Reviewer:
      Sponsor:                |
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 From #31494, previously from comments on #30935:

 > * Convert the "contained" flag to something more like "NOCOPY NOCHECK
 NODUMP".
 > * at the higher level, split "contained" into "derived" and "obsolete".
 At the lower level, give both "derived" and "obsolete" the flags "NOCOPY
 NOCHECK NODUMP".
 >     * even though these concepts may have the same flags right now, we
 don't want to lock them in to having the same flags in future. Because
 they are separate concepts that are quite different. For example,
 "derived" has a (derived) value, but "obsolete" has no value.
 > * Make the "invisible" flag more like "NODUMP NOREAD".
 > * Make sure that all low-level flags are orthogonal.
 > * Make sure that "invisible" vs "hidden" is more clear.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31625>
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