Added "is_playing", "get_title", "get_time" and "get_length" to get computer-readable output (for third-party programs)

- bind to ::1 by default if --ipv6 is passed,
- do not overflow Unix socket path,
- use a different option (--rc-unix) for Unix socket.

* modules/control/rc.c: added option to listen on a socket instead of only stdin.
   Inspired from a patch by Bernhard Rosenkraenzer <bero at arklinux dot org>.

* src/input/input.c:
   + introduced input_item_t that is shared between the playlist/vlm and the input thread (contains input name, options, infos, etc...).
   + changed prototype of input_CreateThread() to input_thread_t *input_CreateThread( vlc_object_t *, input_item_t * ).
* ALL: use input_item_t and INPUT_ADD_INFO when necessary.

* Drop the old scope plugin (not ported to aout3)

* ALL: removed useless add_category_hint().

What may be broken (untested):
------------------------------
   - Theora and Speex decoders
   - some interfaces
   - VCDX and CDDAX access

The problems shouldn't hopefully excess compilation glitches.
(removal of AddExt, of psz_author, and prototype of Add)

Additionnaly, interfaces that do not support item-change will have
update problems.

* Updated modules list

* msvc/vlc.dsw: removed non-existant plugins.

 * gui/beos: removed not really used STARTED_S, and NOT_STARTED_S input
 state.
 * gui/wxwindows: use 'position' and 'time' variables -> seek improved
 for avi and mp4 and accurate time display :)

       Added support of "seek n%" (Usefull when mux_rate is nul )

* ALL: changes to the playlist_Add() and VLC_AddTarget() proto to include a list of options associated with the input.
* src/input/input.c: parses the input options list before spawning the input and create object variables for these options. Options are of the form "[no[-]]foo[=bar]" where foo is the option name and bar is its value.
* src/input/input.c, src/input/input_dec.c: use the object var api to get the value of the "sout", "sout-video" and "sout-audio" options.
* src/libvlc.c: extended the command line parser to parse input options. Input options must always follow the input they apply to and begin with a ':'.

All these changes allow you to specify input specific options.
eg: ./vlc --no-sout-audio yourvideo.mpeg :sout=udp/http::8080 :sout-audio yourvideo2.mpeg
Here the ":sout" option will only apply to yourvideo.mpeg.
"--no-sout-audio" will be a global option so will apply to yourvideo2.mpeg but the global behaviour is overriden by ":sout-audio" for yourvideo.mpeg.

TODO: - the interfaces need to be modified to benefit from the new playlist_Add() api.
      - only "sout", "sout-video", "sout-audio" implemented for now. To make it work with other options, we need to get rid of all the config_GetFoo() and replace them with var_Create()/var_Change()/var_Get().

    conflicts. Most headers in that directory should probably be renamed to
    their vlc_ equivalent.

* ALL: Capitalize all preferences text strings

* modules/control/rc/rc.c: win32 fixes for the handling of special control keys.

* ALL: changed the prototype of input_AddES() to include enough information so we can build an "video-es", "audio-es" and "spu-es" object variable. These variables can be used by the interfaces to navigate between the elementary streams.
* modules/gui/wxwindows/menus.cpp: use the "foo-es" object variables.

* src/misc/variables.c, ALL: improvements to the object variables api.
   - added another argument to var_Change().
   - added a VLC_VAR_SETTEXT and VLC_VAR_GETTEXT method to var_Change()
     that are used to set/get a friendly name to an object variable.
   - added VLC_VAR_CHOICESCOUNT to var_Change() to be able to retrieve
     the number of availabel choices without having to get their value
     as well.
   - VLC_VAR_ADDCHOICE uses the extra var_Change() argument to assign
     a friendly name to the choice value.
   - VLC_VAR_GETCHOICES retrieves the choices values and their friendly
     names.

* modules/gui/wxwindows/*: first step in implementing menu auto-generation in the wxWindows interface.

* modules/*: sanitization of the modules description strings.

* ALL: Finally fixed the MSVC project files.
       Don't include io.h on win32 when not necessary.
       A few build fixes for MSVC.

* src/misc/win32_specific.c: try to load winsock2 instead of winsock1 when
   present.

* src/libvlc.h, modules/audio_output: added a global --spdif config option
   to allow using the spdif output by default if available.
* modules/misc/dummy/*: on win32 added a quiet mode that doesn't display
   a dos command box.
* modules/control/rc/rc.c: on win32 enabled the echo mode and the
   backspace key.
* modules/codec/mpeg_audio.c: fixed a sync bug.

indicate wether it is an "advanced" option or not. The goal with this is to
hide the user from all the strange options that very seldom needs to be
changed. added an extra argument to all the add_* macros to indicate wether
the item is advanced or not.
* src/libvlc.h: added an "show advanced options" config option default
disabled
* src/libvlc.c: the advanced options are not listed by vlc --help and
friends unless --advanced is used
* modules/gtk/preferences.c: the gtk/gnome preferences dialog don't show
advanced options unless advanced is set
all: set the advanced flag to VLC_FALSE or VLC_TRUE for all options, by
using some common sense. Please check and correct

note: All interfaces should still work like they used to, see the change in
modules/gtk/preferences.c to find out how to "hide" options.

second note: I think I've changed all the modules, but I could not test
everyone for compilation, expect some broken modules (the fix is to add ",
VLC_TRUE" as last argument to the add_* I forgot)

* modules/control/rc/rc.c: finally fixed the rc interface under win32 by
   using WaitForSingleObject() on the console handle and ReadConsoleInput().
   (Closes #59)

  audio output. Consequently, the first argument can be any vlc_object_t.
* modules/gui/macosx/*: greatly simplified volume functions ; you can now
  call aout_Volume* even when there is no audio output, and the volume
  will be saved for later use.

    "interface" variable to "dvdplay" (Closes: #178, #210, and probably a
    bunch of others).
  * ./src/interface/interface.c: added a safety check to circumvent the bug,
    allowing a smooth upgrade.

* modules/access/dvdread/input.c, modules/control/rc/rc.c: fixed typos.

* modules/control/rc/rc.c: Partial fix for the rc interface under win32. On win32, select() only works on
socket descriptors so we don't use it anymore on this platform. Right now we only do a blocking call to
read() although it should be possible to have a fully functionnal interface by using the PeekConsoleInput()
call (someone willing to investigate this ?).