[tor-bugs] #16399 [Tor]: Create rendcache.{c|h} for hidden service descriptor cache

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#16399: Create rendcache.{c|h} for hidden service descriptor cache
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 Reporter:  dgoulet           |          Owner:
     Type:  enhancement       |         Status:  new
 Priority:  normal            |      Milestone:  Tor: 0.2.7.x-final
Component:  Tor               |        Version:
 Keywords:  SponsorR, tor-hs  |  Actual Points:
Parent ID:                    |         Points:
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 For developers and reviewers mental sanity, it would be great to move the
 ABI/API of both service and client hidden service descriptor cache to its
 own set of files.

 Furthermore, to resolve #16389, it would help a lot to do that so we can
 ease development, maintenance, review and have better documentation in one
 single file.

 I propose `rendcache.{c|h}`.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16399>
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