p_playlist() -> p_playlist ???

Add missing include, fix build error

aout_TogleMute() -> aout_ToggleMute()

It will fix interoperability with live555 server.

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)