Support obfs4 bridges
_Originally created by @intrigeri on [#7980 (Redmine)](https://public-redmine-archive.tails.boum.org/code/issues/7980)_
See “obfs4 is ready for general deployment: bridge operators needed\!”
in *Tor Weekly News — October 1st, 2014* for details and pointers. Note
that to this date, obfs4proxy is not in wheezy-backports, but the
package from Jessie should be installable as-in on Wheezy.
Note that obfs4proxy implements support for obfs2, obfs3 and obfs4.
Feature Branch: feature/7980-obfs4
### Related issues
- **Related to** tails/tails#7909
- **Related to** tails/tails#8243
- [x] **Blocked by** tails/tails#7907
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