ALL : Interface modularization.

    Creation of modules "telnet" and "native".

    Work in prevision of new interfaces (RTSP, http, .....) for the
    future.

  . Some details for developers:

      * created a new generic interface called "C_Interface"
      * created a module launcher in C_Admin

      * Issue with threads : Interface is responsible for the vls to
        run. If there is no interface, vls stops immediately.

        i.e : if there are n interface -> (n-1) thread and the last
        interfaces, the last stays in the main thread.

  . Bugs :

     * Connections doesn't not work with threaded interfaces. Only
       the main thread interface responds. So if you launch n telnet
       interface, only the last one would work ...

     * SIGINT are not well handled : I chose temporarily to kill the app
       (otherwise it does not stop...)