Also, make it clearer what is shared and instance-specific

So,
libvlc_t ==> libvlc_global_t
vlc_t ==> libvlc_int_t (internal instance)

p_object->p_libvlc ==> p_object->p_libvlc_globale
p_object->p_vlc ==> p_object->p_libvlc

VLC_OBJECT_VLC ==> VLC_OBJECT_LIBVLC

And by the way, there is some cleanup required :) (ie, some things are created in the global object instead of the instance-specific one)

* Reduce vlc_object_find calls

* AccessOutWrite can be called with input already detached (Closes:#523)

(da big courmischage)

   arrives too late to the mux.

  - for muxers that request some preparsing before starting muxing,
    we now wait for 1.5 seconds worth of data to be in the fifo instead
    of waiting for 1.5 seconds of real-time.
  - if we have have control over the output pace, we also wait before
    starting muxing (produces nicer streams).

front of a option name) to allow handling of multiple string options.

* src/stream_output/stream_output.c: allows spaces in the options of the sout mrl. Heading and trailing spaces in options will be removed.

  of atoi, because atoi assumes base 10.
* modules/access/dvb/access.c: New --dvb-caching option.
* modules/mux/mpeg/ts.c: Cosmetics.

 * stream_output.c: sout_ParseCfg warns about unknown option.

* modules/stream_out/duplicate.c: small coding style changes.
* modules/stream_out/transcode.c:
  + Forward the aopts{foo=bar,etc..} and vopts={foo=bar,etc...} options to the encoders.
  + Got rid of the ffmpeg encoder specific options.
* modules/codec/ffmpeg/*:
  + Changed the encoder options to normal config options.
  + Parse the options forwarded by transcode.
* include/vlc_codec.h:
  + encoder_t cleanup.
  + include a "sout_cfg_t *" in encoder_t to allow passing options.

access_out, mux, stream_out to the creator to make VLC_VAR_DOINHERIT
working.
 (Basically it takes an options list that will be 'var_Created' and if present
in sout_cfg_t initialised).

when streaming (it's better because of the way sout works).
 * stream_output/stream_output.c: when removing a stream, stop waiting
and start muxing if data are already here (needed for sout with pace
control).

 Both will help to allow muxing (nearly?) all frames, even the last ones.