The "Open" and "Run" functions of the interface have been changed to
  - avoid running the interface in the main thread (Windows)
  - destroy all ressources in reverse order from creation
  - a few cleanup/cosmetic things

Note that all outputs onto the same TCP port must have the same certificates.

(cherry picked from commit 0e4d1695)

If you want to try it and report bugs use --enable-projectm.

The spec says that the 2nd round of packets need to have the 1st 4 bytes be the
timestamp (potentially zero) and the next 4 bytes be zero. The bytes after that
should be random. (not necessarily cryptographically secure, just for
establishing a unique echo response in the 3rd round of packets).
Signed-off-by: Rémi Duraffort <ivoire@videolan.org>