Initial support for registering and handling some shared stats 

Minor headers cleanup

Forward port of branches/0.8.1-jpsaman-thedj revision 12070. The OSD menu subsystem consists of two parts a core part (src/osd, include/vlc_osd.h) and a subfilter (modules/video_filter/osdmenu.c). The OSD menu can be used locally or it can be streamed. It depends on the way the functionality is called from the vlc commandline. Currently there is only one way to make the subpictures appear on the video and that is through the rc-interface. The following commands are supported by it: "menu on" (show OSD menu), "menu off" (hide OSD menu), "menu left" (highlight button on the left), "menu right" (highlight button on the right), "menu up" (highlight button above), "menu down" (highlight button below) or "menu select" (perform hotkey action). When there is no button on the left, right, up or down then the menu-command will be ignored.

To stream use a commandline similar to this:

./vlc dvdsimple:///dev/dvd --sub-filter=osdmenu --osdmenu-file=share/osdmenu/default.cfg --extraintf rc --sout '#transcode{sfilter=osdmenu}:std{mux=ts,access=udp,url=127.0.0.1:1234}' -vvvv

For local playback a commandline like this is needed:

./vlc dvdsimple:///dev/dvd --sub-filter=osdmenu --osdmenu-file=share/osdmenu/default.cfg -vvvv

Have fun with the basic functionality - jpsaman.

(da big courmischage)

* include/vlc_xml.h, src/misc/xml.c: core wrapper for XML modules.
* modules/misc/xml/xtag.c: trivial XML parser module.
* modules/misc/xml/libxml.c: XML parser module using libxml2.
* modules/gui/skins2/parser/*: removed dependancy on libxml2 and use an XML module.

* modules/stream_out/transcode.c: re-use the SPU engine.
* src/video_output/vout_subpictures.c: support for resizing subpictures.

  - chroma + resizing video filter (using the filter_t architecture).
* modules/codec/ffmpeg/*:
  - cleanup + small updates.
* modules/codec/speex.c, theora.c, vorbis.c:
  - got rid of pf_header() in the encoder.
  - store the headers in fmt_out.p_extra (this will break the ogg muxer for now).
* modules/codec/libmpeg2.c, modules/codec/ffmpeg/video.c:
  - added a p_dec->b_pace_control field to signal if the decoder is allowed to drop frames.
* modules/stream_out/transcode.c:
  - heavy cleanup.
  - re-use video decoder modules and got rid of the duplicated ffmpeg video decoder.
  - use video filters for chroma conversion and resizing.
  (a few things are broken now like deinterlacing but I'll repair them asap).

   simple interface to create and use OpenGL windows
 * modules/video_output/x11/glx.c: the GLX vout now implements the
  "opengl provider" interface
 * modules/visualization/galaktos/*: no more dependency on GLX: we use
   the generic opengl provider interface instead.

* src/input/input.c: input_StopThread() sets b_die on demux2 as well.

  - The SAP handler now runs in a separate thread.
  - RTP sessions can be announced with sap (sdp=sap://,name=...)
	TODO: Make this more configurable
  - Better SDP generation (the timestamp problem is not resolved)
	About this, there is a problem : as, for a RTP session, the URI
        is the complete SDP, if the session is recreated, as the URI has 
        changed, a new item is added to the playlist
  - Experimental flow control algorithm :
       It does not follow the "Recommended" implementation, as it needs
       to count the sessions (to achieve this, we should make this work
       together with the SAP listener)
       It is disabled by default (use --sap-flow-control to enable).
       When it is disabled, sap announcement interval is set by --sap-interval

* src/misc/net.c : created net_ReadNonBlock
* sap.c : Fixed memory problem

 * http.c: begin support of vlm interraction (not yet documented).

* Removed trailing spaces

* modules/gui/wxwindows/*: don't forget to delete the timer.
   Use wxApp::OnExit() to cleanup the dialogs provider.
   Added a "Miscellaneous" section to the menu. Added a "Switch interface" and "Add interface" entries to this menu.
* modules/gui/skins/src/*: dialog providers have object types of VLC_OBJECT_DIALOGS.
   Don't forget to attach/detach the dialogs provider to its parent intf.
   Work around a bug in imlib2 when we close the plugin.
* src/misc/objects.c, include/vlc_objects.h: added VLC_OBJECT_DIALOGS for dialogs providers.
* src/interface/interface.c, include/vlc_interface.h: added 2 object variables to switch/add interfaces on the fly (intf-switch and intf-add).

* include/vlc_codec.h: defines decoders/encoders related structures here.
* include/vlc_video.h: new video_frame_format_t structure which defines the properties of a video frame.
* include/vlc/decoder.h: include vlc_codec.h
* src/misc/objects.c: added VLC_OBJECT_PACKETIZER and VLC_OBJECT_ENCODER object types.
* modules/stream_out/transcode.c, modules/codec/theora.c: experimental theora video encoder.
* src/input/*: some cleanup.

* ALL: Introduction of a new api for decoders.
   The final aim of this new api is to make it possible to use the decoders from other modules like the transcoder for instance.
   Only a few decoders have been ported to the new api (a52, libmpeg2, dts, vorbis, theora) so the old api is still supported.

   Don't hold your breath, there is still much work to do before we reach this goal.

* modules/codec/a52.c, libmpeg2., dts.c, vorbis.c, theora.c:
   Converted to the new api.
   Merged the a52 and vorbis packetizers in their respective decoders (removes a lot of code duplication).
   New dts and theora packetizers (merged in their respective decoders).

   instead of a (vlc_list_t); this modification was needed because BCB
   doesn't like at all when a function (compiled with mingw32) returns
   a struct...
 * ALL: modified the files to take this change into account
 * modules/gui/win32/menu.cpp: enabled the "Add interface" command

* ALL: added a new vlc_list_t common type. vlc_list_find() and vlc_list_release() have been modified
to use this new type.

  * ./include/main.h: removed p_vlc->i_status because it was not sufficient
    to represent all the possible states of p_vlc; each part should be tested
    separately upon destruction.
  * ./src/misc/objects.c: fixed a signed/unsigned bug that prevented creation
    of VLC_OBJECT_GENERIC objects.

  * ./src/misc/variables.c: added the VLC_VAR_COMMAND type which is simply a
    variable that stores a function pointer, and calls it when var_Get is
    called for it. The function argument is taken in val.psz_string.
  * ./src/misc/objects.c: vlc_dumpstructure and vlc_liststructure are no longer
    exported to the rest of the program; instead, they're VLC_VAR_COMMAND vars
    ("tree" and "list").
  * ./modules/control/rc/rc.c: moved a few commands to VLC_VAR_COMMAND vars.

  * ./include/vlc/vlc.h: changed the naming conventions for libvlc. Now
    exported functions start with VLC_ instead of vlc_ to avoid conflicts.
  * ./include/vlc/vlc.h: removed the vlc_object_t, vlc_list_t, vlc_error_t
    and vlc_t types; they are now internal types only.
  * ./include/vlc/vlc.h: merged the reentrant and non-reentrant libvlc
    calls. In non-reentrant mode, we just use 0 as the first argument. In
    reentrant mode, we use an object's ID. (see below)

Internal changes:
  * ./src/libvlc.c, ./src/misc/objects.c: instead of manipulating vlc_object_t
    pointers, we manipulate their i_object_id. When needed, an object is
    retrieved using vlc_object_get (I hope the lookup isn't too expensive,
    that's why I designed the pp_objects layout to allow log2(n) seeks).
  * ./src/misc/objects.c: activated the per-object variable storage. Unused
    yet, unless you want to try "getfoo" and "setfoo blablah" in vlc -I rc.
  * ./include/vlc_objects.h: moved the vlc_object_t and vlc_list_t definitions
    here.

Misc:
  * ./src/vlc.c, ./mozilla/vlcshell.cpp: removed inclusion of config.h in
    code portions not part of libvlc; it was just required for the
    COPYRIGHT_MESSAGE string which is now available from VLC_Version().

    p_libvlc, and each p_vlc is a child of p_libvlc. Reasons for this are:

     o the module bank and the message bank only need to be initialized once,
       which gives faster loads when multiple instances of libvlc are used,
     o we allow the possibility of different p_vlc sharing objects, for
       instance the audio output,
     o the CPU detection is only done once.

    This patch is not polished yet, but I cannot do any intensive tests for
    the moment because of a bug somewhere that leaves audio output objects
    lying here and there which needs to be investigated first. The current
    major issue is that the module bank is no longer freed.

    the vlc_object_* and vlc_list_* functions to manage modules. The Win32
    interface doesn't build, but I'll fix this.

    vlc_object_find() but returns a list of _all_ the matching objects. Only
    works with FIND_ANYWHERE at the moment.
  * ./modules/gui/gtk/preferences.c, ./modules/gui/kde/preferences.cpp,
    ./modules/gui/win32/preferences.cpp: the module lists in the preferences
    menus work again.
  * ./src/misc/objects.c: added a missing sizeof that caused crashes because
    the reindexing of the global object array was incomplete.
  * ./include/modules_inner.h: propagated the module long description to its
    submodules.

    just as 'd' displayed a tree of attached objects.
  * ./src/misc/modules.c: added a missing header.

* Prepared for some advances in the aout3 clock management.
* Added the first stone of the forthcoming stream output.

    only have one parent, because I don't want to deal with cycles, and each
    created object is indexed in a global array. This feature is unused yet,
    but it will speed up vlc_object_find(FIND_ANYWHERE).
  * ./debian/rules: activated the faad codec.
  * ./doc/fortunes.txt: new fortune cookies.
  * ./modules/codec/mpeg_video/headers.c: reduced the use of attach/detach.
  * ./modules/audio_output/oss.c: fixed two compilation warnings.

    about 2000 lines of code.

    I could not test everything on every architecture, so please report
    any module breakage (especially on BeOS, OSX and QNX).

    vlc_object_destroy (idea from stef).
  * ./po/pl.po: updated polish translation, thanks to Arkadiusz Lipiec
    <alipiec@adrenalina.pl>.

  * ./src/misc/objects.c: we do not hang on attempt to destroy an object with
    a non-zero reference count, but we still complain.
  * ./plugins/gtk/gtk_control.c, plugins/gtk/gtk_playlist.c: most controls such
    as play, pause, stop, next, fast etc. work again.
  * ./plugins/gtk/gnome_*: got rid of lots of useless wrappers which were a
    workaround for a bug in Glade. Instead, bootstrap.sh does the Glade fixes.
  * ./plugins/ffmpeg/ffmpeg.c: if there is already a video output with the
    appropriate properties, we use it.

    bug which might have been the cause of crashes.
  * ./plugins/filter/crop.c: attempt at an automatic border cropping filter,
    using "--filter crop --autocrop".
  * ./vlc.spec: added missing filters to the RPM generation.
  * ./src/misc/objects.c: commented all functions.
  * ./src/misc/objects.c: implemented vlc_object_find( , , FIND_ANYWHERE).
  * ./src/misc/objects.c: renamed vlc_object_unlink to vlc_object_detach.