[tbb-bugs] #14919 [Tor Browser]: Update the obfs4proxy tag, and use it as the ScrambleSuit PT provider.

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#14919: Update the obfs4proxy tag, and use it as the ScrambleSuit PT provider.
-----------------------------------+--------------------------
 Reporter:  yawning                |          Owner:  tbb-team
     Type:  defect                 |         Status:  new
 Priority:  normal                 |      Milestone:
Component:  Tor Browser            |        Version:
 Keywords:  TorBrowserTeam201502R  |  Actual Points:
Parent ID:                         |         Points:
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 obfs4proxy-0.0.4 is out now.

 This means:
  * The old go.crypto stuff in the build can be removed.
  * obfs4proxy can/should be used as the `ClientTransportPlugin` for
 scramblesuit.

 Ideally I'd like to see this in the next Tor Browser alpha so the code
 gets more testing, and I will attach a branch that does all of these
 things.  Note that while obfsproxy is no longer referenced from any of the
 PT torrcs, it is still needed as a run time dependency for FTE.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/14919>
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